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    [Illustration: Geology of Canyonlands]

    [Illustration: LOOKING NORTH FROM EAST WALL OF DEVILS LANE, just
    south of the Silver Stairs. Needles are Cedar Mesa Sandstone.
    Junction Butte and Grand View Point lie across Colorado River in
    background.]

    [Illustration: The Geologic Story of Canyonlands NATIONAL PARK]




                        _The Geologic Story of_
                              Canyonlands
                             NATIONAL PARK


                            By S. W. Lohman
                               _Graphics
                           by John R. Stacy_

                    GEOLOGICAL SURVEY BULLETIN 1327


                UNITED STATES DEPARTMENT OF THE INTERIOR
                    ROGERS C. B. MORTON, _Secretary_

                           GEOLOGICAL SURVEY
                       V. E. McKelvey, _Director_


             Library of Congress catalog-card No. 74-600043

    [Illustration: U.S. DEPARTMENT OF THE INTERIOR · MARCH 3, 1849]

                 U.S. GOVERNMENT PRINTING OFFICE: 1974


 For sale by the Superintendent of Documents, U.S. Government Printing
                                 Office
           Washington, D.C. 20402--Price $2.65 (paper covers)
                        Stock Number 2401-02498




                                Contents


                                                                     Page
  A new park is born                                                    1
  Major Powell's river expeditions                                      4
  Early history                                                         9
      Prehistoric people                                                9
      Late arrivals                                                    14
  Geographic setting                                                   17
  Rocks and landforms                                                  20
  How to see the park                                                  26
  The high mesas                                                       27
      Island in the Sky                                                27
          Dead Horse Point State Park                                  30
          North entrance                                               34
          Shafer and White Rim Trails                                  34
          Grand View Point                                             36
          Green River Overlook                                         43
          Upheaval Dome                                                43
      Hatch Point                                                      46
          Needles Overlook                                             47
          Canyonlands Overlook                                         48
          U-3 Loop                                                     49
          Anticline Overlook                                           50
      Orange Cliffs                                                    54
  The Benchlands                                                       58
      The Maze and Land of Standing Rocks                              58
      The Needles district                                             60
          Salt, Davis, and Lavender Canyons                            64
          The Needles and The Grabens                                  73
  Canyons of the Green and Colorado Rivers                             85
      Entrenched and cutoff meanders                                   86
      Green River                                                      87
      Colorado River                                                   96
  Summary of geologic history                                         112
  Additional reading                                                  117
  Acknowledgments                                                     118
  Selected references                                                 118
  Index                                                               123




                             Illustrations


                                                                     Page
  Frontispiece. Looking north from Devils Lane near Silver Stairs.
  Figure
  1. Map of Canyonlands National Park                                   6
  2. Pictographs on wall of Horseshoe Canyon                           10
  3. The All American Man                                              10
  4. Tower Ruin                                                        11
  5. Newspaper Rock                                                    13
  6. Cave Spring Line Camp                                             15
  7. Canyonlands National Park and vicinity                            19
  8. Shallow inland sea                                                21
  9. Rock column of Canyonlands National Park                          22
  10. Section across Canyonlands National Park                         24
  11. Aerial view of The Neck and Shafer Trail                         28
  12. Merrimac and Monitor Buttes                                      29
  13. Cane Creek anticline (viewed from Dead Horse Point)              30
  14. Cutaway view of anticline                                        31
  15. Looking southwest from Dead Horse Point                          32
  16. Shafer Trail                                                     35
  17. Natural tanks                                                    37
  18. Canyon Viewpoint Arch                                            37
  19. Index map showing photograph localities                          38
  20. The White Rim                                                    40
  21. Monument Basin from Grand View Point                             41
  22. Monument Basin from the air                                      42
  23. Stillwater Canyon and Green River                                44
  24. Turks Head                                                       45
  25. Upheaval Dome                                                    45
  26. Cutaway view of syncline                                         46
  27. Junction Butte and Grand View Point                              48
  28. Syncline in core of Lockhart Basin                               49
  29. View westward from U-3 loop                                      50
  30. Looking north from Anticline Overlook                            51
  31. Cane Creek anticline (viewed from Anticline Overlook)            52
  32. View southeastward from The Spur                                 55
  33. Looking north down Millard Canyon                                56
  34. Elaterite seeping from White Rim Sandstone                       59
  35. White Rim Sandstone                                              59
  36. The Doll House                                                   60
  37. Church Rock                                                      61
  38. North and south Six-Shooter Peaks                                62
  39. Squaw Flat Campground                                            64
  40. Aerial view eastward across Salt Canyon                          65
  41. Wooden Shoe                                                      66
  42. Paul Bunyans Potty                                               67
  43. Angel Arch                                                       69
  44. Fisheye Arch                                                     70
  45. Wedding Ring Arch                                                71
  46. Hand Holt Arch                                                   71
  47. Cleft Arch                                                       72
  48. Arch                                                             72
  49. The Needles                                                      73
  50. Chesler Park in The Needles                                      73
  51. The Needles and The Grabens                                      74
  52. Trail to Druid Arch                                              77
  53. Upper Elephant Canyon                                            77
  54. Druid Arch                                                       78
  55. A simple graben                                                  80
  56. Cutaway view of normal fault                                     80
  57. West wall of Cyclone Canyon Graben                               81
  58. Lower Elephant Canyon                                            81
  59. The confluence from the air                                      82
  60. The confluence from Confluence Overlook                          83
  61. Cataract Canyon                                                  84
  62. Bowknot Bend                                                     89
  63. Inscription by Julien                                            91
  64. Buttes of the Cross                                              92
  65. Anderson Bottom Rincon                                           94
  66. Drainage changes at Anderson Bottom Rincon                       94
  67. Stillwater Canyon                                                95
  68. The Portal                                                       97
  69. The _Canyon King_                                                98
  70. Potash mine of Texas Gulf, Inc                                   99
  71. Evaporation ponds                                                99
  72. Petrified log                                                   102
  73. Relatively recent rincons along Indian Creek                    103
  74. The Loop                                                        104
  75. Reverse fault                                                   105
  76. Cutaway view of reverse fault                                   105
  77. Salt Creek Canyon                                               107
  78. The Slide                                                       107
  79. Gypsum plug                                                     109
  80. Geologic time spiral                                            110
  81. Late Cretaceous sea                                             114




                           A New Park is Born


On September 12, 1964, President Lyndon B. Johnson signed an act of
Congress establishing Canyonlands as our thirty-second national park,
the first addition to the park system since 1956.

The birth of Canyonlands National Park was not without labor pains. In
the 1930's virtually all the vast canyon country between Moab, Utah, and
Grand Canyon, Ariz., was studied for a projected Escalante National
Park. But Escalante failed to get off the ground, even when a second
attempt was made in the 1950's. Not until another proposal had been made
and legislative compromises had been worked out did the park
materialize, this time under a new name--Canyonlands. Among the many
dignitaries who witnessed the signature on September 12 was one of the
men most responsible for the park's creation, park superintendent Bates
E. Wilson, who did the pioneer spade work in the field.

The newborn park covered 400 square miles[1] at the junction of the
Green and Colorado Rivers in Utah. It included such magnificent features
as Island in the Sky, The Needles, Upheaval Dome, and the two great
stone formations, Angel Arch and Druid Arch. On November 16, 1971,
President Richard M. Nixon signed an act of Congress enlarging the park
by 125 square miles in four separate parcels of land, so the area now
totals 525 square miles, all in southeastern Utah, as shown on the map
(fig. 1). The northern boundary was extended to include parts of Taylor
and Shafer Canyons. The addition at the southeast corner takes in the
headwaters of Salt and Lavender Canyons and part of Davis' Canyon. The
largest addition, at the southwest corner, includes grotesquely carved
areas bearing such colorful names as The Maze, Land of Standing Rocks,
The Fins, The Doll House (fig. 36), and Ernies Country (named after
Ernie Larson, an early-day sheepman). The fourth parcel lies about 8
miles west of the northwest corner and encompasses much of Horseshoe
Canyon, whose walls are adorned by striking pictographs (fig. 2).

At this writing (1973) the park is still in its infancy, with most of
the planned developments and improvements awaiting time and money, but a
good start has been made. In 1960 my family and I first traversed Island
in the Sky to Grand View Point over a rough jeep trail; now it is
reached with ease over a good graded road which eventually will be
paved. A temporary trailer-housed entrance station near The Neck will be
replaced by permanent headquarters for the Island in the Sky district
after water is piped up from wells drilled near the mouth of Taylor
Canyon.

In August 1965, when the Park was but 11 months old, we drove the family
car over a two-track dirt "road" from Dugout Ranch to Cave
Spring--temporary headquarters for the Needles district of the park,
whose personnel were housed partly in trailers and partly in the cave.
Now a modern paved highway, built by the State (Utah Highway 11) for 19
miles to Dugout Ranch and by San Juan County, the State of Utah, and the
National Park Service for the next 18 miles, extends a total of 38 miles
from U.S. Highway 163 to a new modern campground at Squaw Flat (fig.
39). The entrance station and housing for park personnel are now in
trailers about 2 miles west of Cave Spring, but the trailers will be
replaced by permanent structures. A shallow well near temporary
headquarters supplies the only water available to the campground 1.5
miles to the west, but a new supply is to be developed for the
campground and permanent headquarters. Groceries, gasoline, trailer
hookups, and charter flights are available at Canyonlands Resort, just
outside the eastern park boundary. The old cowboy line camp at Cave
Spring has been restored so that visitors can see this phase of colorful
Canyonlands history (fig. 6). Except for 2-1/2 miles of partly graded
road west from Squaw Flat, all travel to the west and south is by
four-wheel-drive vehicle or on foot. In order to reach the confluence of
the Green and Colorado Rivers, The Grabens, and Chesler and Virginia
Parks, drivers must conquer formidable Elephant Hill, with its 40
percent grades and backup switchbacks. SOB Hill and the Silver Stairs
also tax the skill and patience of jeepsters. Parts of this area will
eventually be reached by graded roads, possibly by about 1977, but many
hope that much of it will be kept accessible only by jeep or foot
trails.

Bates Wilson, recently retired superintendent not only of Canyonlands
National Park but also of nearby Arches National Park and of Natural
Bridges National Monument about 80 miles to the south, is one of the few
men in the park service who has guided a national park through all
phases--location, promotion, establishment, and initial development. He
retired in June 1972 to a ranch along the Colorado River north of Moab.

Unless credited to others, for which grateful acknowledgment is made,
the color photographs were taken by me. Most of these were taken on 4-
by 5-inch film in a tripod-mounted press camera using lenses of several
focal lengths, but a few were taken on 35-millimeter film. Unless
credited to others, the black and white photographs were kindly loaned
from the Moab and Arches files of the National Park Service. The points
from which most of the photographs were taken are shown in figure 19.

    [Illustration: Petroglyph]




Major Powell's River Expeditions


Although Major John Wesley Powell was not the first geologist to view
the canyon lands, his two daring boat trips down the Green and Colorado
Rivers in 1869 and 1871 made history by bringing to light the first
descriptions of the geography and geology of what was then the largest
remaining uncharted wilderness in the United States. Many landmarks
along the canyons in the park were named by Powell and his men during
those explorations. J. S. Newberry is thought to have been the first
geologist to view the canyon lands--at least he seems to have been the
first one whose observations were recorded (1861), but the more
comprehensive findings of Powell (1875) were the ones that made history.

The 100th anniversary of Major Powell's pioneer exploration of the Green
and Colorado Rivers was commemorated in 1969 by a national centennial
sponsored jointly by the U.S. Department of the Interior, the
Smithsonian Institution, the National Geographic Society, and many other
organizations. This touched off many magazine and newspaper articles,
several commemorative programs and dedications, and several publications
of lasting interest. Noteworthy among the latter is U.S. Geological
Survey Professional Paper 669 entitled "The Colorado River Region and
John Wesley Powell." Of its four separate parts, two are of special
interest to our Canyonlands story: part A, "John Wesley Powell: Pioneer
Statesman of Federal Science," by Rabbitt (1969) and part C, "Geologic
History of the Colorado River," by Hunt (1969). An interesting history
of the National Park Service by Everhart (1972) was published as part of
the national park centennial effort. The Powell Society, Ltd., of
Denver, Colo., was founded mainly to publish four "River Runners' Guides
to the Canyons of the Green and Colorado Rivers, with Emphasis on
Geologic Features," covering five reaches of the two rivers from Flaming
Gorge Dam, Utah, to Grand Canyon, Ariz. One of these by Mutschler (1969)
covers Labyrinth, Stillwater, and Cataract Canyons, all in Canyonlands
National Park. Another guidebook by Baars and Molenaar (1971) covers the
Colorado River from about Potash, Utah, to the confluence with the
Green, and Cataract Canyon. It is difficult to realize that thousands of
people annually now boat down the canyons Powell dared to explore
without knowledge of the dangers that lay ahead.

During the summer of 1968 a U.S. Geological Survey expedition led by
Eugene M. Shoemaker retraced the historic 1869 and 1871 river voyages of
Major Powell, in order to reoccupy the camera stations of the 1871
voyage and rephotograph the same scenes nearly 100 years later.
Remarkably enough, about 150 camera stations were recovered, many
requiring considerable search, and official photographer Hal G. Stephens
rephotographed the scenes taken with cumbersome wet-plate cameras nearly
100 years earlier by E. O. Beaman (above the site of Lees Ferry) and by
J. K. Hillers (below the site). A report containing these remarkable
sets of before and after photographs hopefully will be published
eventually as a delayed part of the Powell centennial. A few pairs have
been published by others (Baars and Molenaar, 1971, p. 90-99), and two
pairs are shown herein as figures 62 and 67. As these photographs show,
in most places the rocks and even the vegetation remain virtually
unchanged after nearly a century, but a few other pairs not included
herein show catastrophic changes resulting from local floods or
rockfalls.

    [Illustration: CANYONLANDS NATIONAL PARK, showing location in Utah,
    Lake Powell, Dead Horse Point State Park, boundaries, streams,
    roads, trails, landforms, and principal named features. There was
    insufficient room to show all named features; some not shown are
    related in text by distance and direction to named ones, and some
    additional names are given in figures 7, 51, and 59. Hans Flat
    Ranger Station near left border is in Glen Canyon National
    Recreation Area. The reader is referred to road maps issued by the
    State or by oil companies for the location of U.S. Highway 163
    (shown as 160 on old maps) and other nearby roads and for the
    locations of the towns of Green River, Crescent Junction, Moab, La
    Sal Junction, and Monticello. Visitors also can obtain pamphlets at
    the entrance stations to the Needles and Island in the Sky districts
    of the park or at the National Park Service office in Moab; these
    contain up-to-date maps of the park and the latest available
    information on roads, trails, campsites, and picnic sites. (Fig. 1)]

On June 26, 1969, state and local officials met along the Green River at
the mouth of Split Mountain Canyon, in Dinosaur National Monument, to
dedicate a monument to Major Powell, commemorating the 100th anniversary
of his first river trip, and to dedicate the Powell Centennial Scenic
Drive, also known as the Powell Memorial Highway. In the absence of any
roads closely paralleling the Green and Colorado Rivers except for short
distances, this route is virtually the only means of approach to the
rivers and comprises parts of several state and federal highways
connecting Green River, Wyo., and Grand Canyon, Ariz. A segment of it,
U.S. Highway 163, connects Crescent Junction, Moab, Monticello, and
Blanding, all in Utah, and provides the principal access routes to
Canyonlands and Arches National Parks and Natural Bridges National
Monument.

The ceremonies at the mouth of Split Mountain Canyon began with the
landing of the official party flotilla of four boats similar to the ones
used 100 years earlier by Powell, who was impersonated by a bearded man
dressed to resemble the one-armed major. After the dedication, the four
boats resumed the voyage down the Green River for another ceremony.

On June 29 a second monument was dedicated at the head of Desolation
Canyon, some 50 miles southwest of Vernal, Utah, where the 1869 Powell
expedition first ventured into the then unknown wilderness. The bronze
plaque identifies Desolation Canyon, named by Powell, as a national
historic landmark that comprises 58,000 acres in an area 1 mile wide on
each side of a 95-mile reach of the Green River.

    [Illustration: Petroglyph]




Early History


                           Prehistoric people

There is abundant evidence that the canyon lands were inhabited by cliff
dwellers centuries before the explorations of Powell or the earlier
visits of the Spanish explorers and the fur trappers. Projectile points
and other artifacts found in the nearby La Sal and Abajo Mountains
indicate occupation by aborigines from about 3,000-2,000 B.C. to about 1
A.D. (Hunt, 1956).

Archeologists have found evidence of two occupations by prehistoric
peoples in and near Canyonlands National Park--the Fremont people around
850 or 900 A.D. and the Pueblo or Anasazi people from about 1075 to
their departure in the late 12th century (Jennings, 1970). Within the
park, the most densely populated area was along Salt Canyon and its
tributaries in the Needles district, but many prehistoric dwellings and
granaries are also found just south of the park in Beef Basin and Ruin
Park.

The Fremont people, who were mainly hunters, seemingly left no
artifacts, but they did leave beautiful pictographs, or rock paintings,
such as the group of ghostly human figures on the sandstone wall of
Horseshoe Canyon (fig. 2), in the detached unit northwest of the park
proper (fig. 1). The All American Man (fig. 3), a most unusual "Humpty
Dumpty" figure painted in red, white, and blue on the wall of a cave
about 3-1/3 miles above the cable across the east fork of Salt Canyon,
is believed to have been done in the Fremont style, but as shown in the
photograph, it is next to one of three dwellings in the same cave that
were built later by the Anasazi people. Tower Ruin (fig. 4) is one of
many well-preserved granaries built by the Anasazi, who farmed the flood
plains of creeks such as Salt and Horse Canyons. According to Jennings
(1970),

  There is some evidence that these early Utah people practiced a form
  of irrigation, using shallow ditches to carry water to their crops.
  There is also evidence that a change in climate sometime around the
  late 12th century brought about summer flash flooding and induced the
  cliff dwellers to abandon their Canyonlands homes and farms.

    [Illustration: PICTOGRAPHS ON WALL OF HORSESHOE CANYON, believed to
    have been made by Fremont people about 1,000 years ago. Numbered
    chalkmarks 1 foot apart along bottom were made by some previous
    photographer. Photograph by Walter Meayers Edwards, © 1971 National
    Geographic Society. (Fig. 2)]

    [Illustration: THE ALL AMERICAN MAN, on wall of cave in Cedar Mesa
    Sandstone Member of Cutler Formation along upper Salt Canyon,
    believed to have been painted by Fremont people. Granary on right
    was built by Anasazi people. Chalk outline was added by some
    previous photographer. Photograph by National Park Service. (Fig.
    3)]

    [Illustration: TOWER RUIN, an Anasazi granary in cave in Cedar Mesa
    Sandstone Member along tributary of Horse Canyon. (Fig. 4)]

Visitors to the Needles district pass through Indian Creek State Park 12
miles west of U.S. Highway 163. The principal attraction, which is
visible at the base of the Wingate Sandstone cliff on the right (north),
is Newspaper Rock (fig. 5), one of the best preserved and most
intriguing petroglyphs, or rock inscriptions, in the canyon lands. Many
of the older cliff faces of the Wingate and Navajo Sandstones are
darkened or blackened by desert varnish, a natural pigment of iron and
manganese oxides. The prehistoric inhabitants of the canyon country
learned that effective and enduring designs could be created simply by
chiseling through the thin dark layer to reveal the buff or tan
sandstone beneath. According to Jesse D. Jennings (letter of Mar. 20,
1962, to Utah Div. Parks and Recreation),

  There are at least three periods of workmanship visible on the rock.
  The last is quite recent since it shows men mounted on horses [brought
  in by Spanish explorers]. These are probably less than 200 years old
  and are probably the work of Ute tribesmen. The others cannot be
  identified with any specific cultural group, although the earliest may
  be as much as one thousand years old and are probably the work of the
  so-called "Fremont" peoples * * *

In addition to the designs by the Fremont, Anasazi, and Ute artists, you
will note a few names and dates as late as 1954.

    [Illustration: Petroglyph]

    [Illustration: NEWSPAPER ROCK, petroglyphs cut in Wingate Sandstone
    cliff in Indian Creek State Park. Inscriptions probably span about
    1,000 years and include figures by Fremont, Anasazi, and Ute people
    (mounted horsemen) and by a few early white settlers. (Fig. 5)]


                             Late arrivals

The modern history of Canyonlands is as colorful as the canyons
themselves, and involves Indians, cattlemen, bank robbers, cattle
rustlers, and horsethieves, followed by oil drillers, uranium hunters,
potash miners, jeepsters, boaters, and tourists. A brief summary of
their activities is taken mainly from a recent account by Maxine Newell
(1970), to whose work you are referred for further details.

Bands of Ute and Navajo Indians roamed the canyons and mesas until the
late 1800's, but gradually they were driven out and succeeded by pioneer
cattlemen, the first of whom were George and Silas Green in 1874-75,
followed by the Taylor brothers in 1880-81. Cowboys named many of the
natural features of the area, and the Needles country provided the
scenic background for some of Zane Grey's western tales and for David
Lavender's "One Man's West." Lavender Canyon, whose headwaters were
recently annexed to the park, was named for him. Visitors to the Needles
district pass the Dugout Ranch about 7 miles northwest of Newspaper
Rock. The earliest ranch dwellings were dirt houses built by the
Somerville and Scorup brothers, who bought the huge Indian Creek spread
for $426,000 from the Carlisle Co. in 1918. In 1973 the ranch was
operated by Robert and Heidi Redd, whose line camp at Cave Spring served
as temporary park headquarters and later was restored to a typical line
camp (fig. 6) as part of the Cave Spring Environmental Trail.

Robbers Roost Canyon and Spring some 30 miles west of the park was the
hangout of a horsethief named Cap Brown in the seventies. From 1884
until about 1900 it was the hiding place for the notorious Butch Cassidy
and his Wild Bunch, who robbed banks, trains, and mine payrolls and
stole or traded horses and cattle from the ranchers. Cassidy and his
gang managed to get along with the cattlemen by either replacing or
paying for most of the horses and cattle, but the law finally drove them
out, and Butch, the Sundance Kid, and a woman named Etta Place moved to
Bolivia. According to the movie version, Butch and the Sundance Kid were
hunted down and shot by Bolivian soldiers for robbing banks and mine
payrolls, but according to Baker (1971) Butch returned safely to the
United States and died in the Northwest in 1943 or 1944, and the
Sundance Kid is reported to have died in Casper, Wyo., in 1958 at age
98. Art Ekker (Findley, 1971, fig. 3), present owner of Robbers Roost
Ranch, which contains the former hangout, commented: "A lot of people
are sure that Butch and his gang buried some money around Robbers Roost.
Every so often somebody turns up with a map or a metal detector and
wants to start digging. They've found a lot of rusty tin cans and old
horseshoes."

    [Illustration: CAVE SPRING LINE CAMP. Above, line-camp exterior,
    showing entrance and corral; below, interior, showing furnishings
    and staple food items kept in stock. Served as regular cowboy line
    camp for many years, then as part of temporary park headquarters;
    later restored as part of Cave Spring Environmental Trail. A nearby
    cave, also in Cedar Mesa Sandstone, contains a spring. (Fig. 6)]

    [Illustration: Fig. 6, lower image]

The uranium boom of the 1950's, touched off by Charlie Steen's fabulous
Mi Vida mine south of La Sal, Utah, temporarily skyrocketed the
population of Moab and sent uranium hunters into every nook and cranny
of the canyon lands. Many of the jeep trails were first made then, and
landing strips and prospect holes of that period are plentiful. Most of
the prospects were in the Chinle Formation, particularly in the Moss
Back Member at the base, but some were in rocks older than the Chinle,
and some were in younger rocks. The uranium mines in the park are no
longer operating, but production has been resumed in a few mines just
north and east of the park. Information on some of these mines, obtained
from E. P. Beroni (U.S. Atomic Energy Comm., oral commun., Feb. 14,
1973) is given at appropriate places below.

The number of boaters or floaters on the Colorado and Green Rivers is
increasing steadily, and trips by jet boat and other power boats are
available from Moab. Tourist travel over good roads on Island in the Sky
and Hatch Point and by paved road to The Needles also is increasing
steadily. Travel west of the Green River and main stem of the Colorado
River is still restricted largely to a few jeep trails and to hiking or
horseback riding.

    [Illustration: Petroglyph]




Geographic Setting


Geologists have divided the United States into many provinces, each of
which has distinctive geologic and topographic characteristics that set
it apart from the others. One of the most intriguing and scenic of these
is the Colorado Plateaus province, referred to in this report simply as
the Colorado Plateau, or the Plateau. This province, which covers some
150,000 square miles and is not all plateaus, as we shall see, extends
from Rifle, Colo., at the northeast to a little beyond Flagstaff, Ariz.,
at the southwest and from Cedar City, Utah, at the west nearly to
Albuquerque, N. Mex., at the southeast. Canyonlands National Park
appropriately occupies the heart of the Canyon Lands section, one of the
six subdivisions of the Plateau. As the names imply, the Canyon Lands
section of the Plateau comprises a high plateau, generally ranging in
altitude from 5,000 to 7,000 feet, which has been intricately dissected
by literally thousands of canyons.

Canyonlands National Park is drained entirely by the Colorado and Green
Rivers, whose confluence is an important and scenic central feature of
the park (figs. 59, 60). Individual canyons traversed or drained by
these rivers are discussed in later chapters.

When Major Powell reached the confluence in 1869, the river flowing in
from the northeast to join the Green River was called the Grand River,
and the Green and Grand joined there to form the Colorado River. The
Grand River was renamed Colorado River by act of the Colorado State
Legislature approved March 24, 1921, and by act of Congress approved
July 25, 1921. But the old term still remains in names such as Grand
County, Colo., the headwaters region; Grand Valley, a town 16 miles west
of Rifle, Colo.; Grand Valley between Palisade and Mack, Colo.; Grand
Mesa, which towers more than a mile above the Grand and Gunnison River
valleys; Grand Junction, Colo., a city appropriately located at the
confluence of the Grand and Gunnison Rivers; Grand County, Utah, which
the river traverses after entering Utah; and Grand View Point, the
southern terminus of Island in the Sky.

When viewed at a distance of 1 foot, the shaded relief map (fig. 1)
shows the general shape of the land surface in and near Canyonlands
National Park to the same horizontal scale as it would appear to a
person in a spacecraft flying at a height of 250,000 feet, or about 48
miles. This map was prepared by artist John R. Stacy from parts of the
reverse sides of four plastic relief maps[2]--Salina, Moab, Cortez, and
Escalante quadrangles, at a scale of 1:250,000--using a simple time- and
money-saving method he devised (Stacy, 1962).

An image of Canyonlands National Park and vicinity from a satellite at a
height of about 570 miles is shown in figure 7. Note white clouds and
black cloud shadows on right.

    [Illustration: CANYONLANDS NATIONAL PARK AND VICINITY, from NASA's
    unmanned Earth Resources Technology Satellite (ERTS-1), at height of
    about 570 miles. The space image map was prepared from simultaneous
    scanning in three color bands--blue green, red, and near
    infrared--that were combined to produce a false-color image in which
    vigorous green vegetation (forests and irrigated areas) appears
    bright red, water dark blue, and soils and bare rocks various shades
    of blue, blue green, or yellow green. Bright-blue area on west bank
    of Colorado River about 10 miles southwest of Moab is the group of
    large evaporation ponds of Texas Gulf, Inc., shown in figures 31 and
    71. Images were taken at 10:31:10 a.m., Aug. 23, 1972, during the
    432d orbit, telemetered to Alaska, videotaped, then photographed.
    Sun elevation was 53 degrees above horizon from azimuth of 130
    degrees. Image covers an area about 100 miles square. (See scale.)
    Location of Monticello is approximate; that of other towns is
    believed to be correct. Park boundaries are not shown because of
    difficulty in locating them accurately, but features such as
    Colorado and Green Rivers can easily be compared with those in
    figure 1. (Fig. 7).]




Rocks and Landforms


The vivid and varied colors of the bare rocks and the fantastic canyons,
buttes, spires, columns, alcoves, caves, arches, and other erosional
forms of the canyon country result from a fortuitous combination of
geologic and climatic circumstances and events unequaled in most other
parts of the world.

First among these events was the piling up, layer upon layer, of
thousands of feet of sedimentary rocks under a wide variety of
environments. Sedimentary rocks of the region are composed of particles
ranging in size from clay and silt through sand and gravel carried to
their resting places by moving water, silt and sand particles
transported by wind, and some materials precipitated from water
solutions, such as limestone (calcium carbonate), dolomite (calcium and
magnesium carbonate), gypsum (calcium sulfate with some water),
anhydrite (calcium sulfate alone), common salt (sodium chloride), potash
minerals such as potassium chloride, and a few other less common types.
Some of the materials were laid down in shallow seas that once covered
the area (fig. 8) or in lagoons and estuaries near the sea. Some beds
were deposited by streams in inland basins or plains, a few were
deposited in lakes, and some, like the Navajo Sandstone, were carried in
by the wind. The character and thickness of the sedimentary rocks, and
the names and ages assigned to them by geologists, are shown in the rock
column in figure 9 and in the cross sections in figures 10 and 15, and
the history of their deposition is discussed in the chapter "Summary of
Geologic History." The rock column was compiled mainly from generalized
stratigraphic sections given by Baker (1933, 1946), McKnight (1940),
Hinrichs and others (1967, 1971b), and F. A. McKeown and P. P. Orkild
(U.S. Geol. Survey, unpub. data, Mar. 16, 1973).

Not exposed in the area but present far beneath the sedimentary cover,
and exposed in a few surrounding places, are examples of the other two
principal types of rocks: (1) igneous rocks, solidified from molten rock
forced into or above younger rocks along cracks, joints, and faults and
(2) much older metamorphic rocks, formed from other pre-existing rock
types by great heat and pressure at extreme depths. The particles
comprising the sedimentary rocks were derived by weathering and erosion
of rocks of all three types in the headwater regions of the ancestral
Colorado River basin. Igneous rocks of Tertiary Age (fig. 80) form the
nearby La Sal, Abajo, and Henry Mountains (fig. 7).

    [Illustration: SHALLOW INLAND SEA which covered Canyonlands and
    vicinity during Middle Pennsylvanian time. (Fig. 8)]

Second among the main events leading to the formation of the canyon
country was the raising and buckling of the Plateau by earth forces so
that it could be vigorously attacked by various forces of erosion and so
that the rock materials thus pried loose or dissolved could eventually
be carted away to the Gulf of California by the ancestral Colorado
River. Some idea of the enormous volume of rock thus removed is apparent
when you look down some 2,000 feet to the river from any of the high
overlooks, such as Dead Horse Point (fig. 15) or Green River Overlook
(fig. 23), or when you lay a straightedge across the three high mesas in
figure 10 and note the large volume of missing rocks below. Not so
apparent, however, is the fact that some 10,000 feet of younger Mesozoic
and Tertiary rocks that once overlay this high plateau also has been
swept away. In all, the river has carried thousands of cubic miles of
sediment to the sea and is still actively at work on this gigantic
earthmoving project. In an earlier report (Lohman, 1965, p. 42) I
estimated that the rate of removal may have been as great as about 3
cubic miles each century. For a few years the bulk of it was dumped into
Lake Mead, but now Lake Powell is getting much of it. When these and
other reservoirs ultimately become filled with sediment, for reservoirs
and lakes are but temporary things, the Gulf of California will again
become the burial ground.

    [Illustration: ROCK COLUMN OF CANYONLANDS NATIONAL PARK. One foot
    equals 0.305 meter. (Fig. 9)]


  AGE (millions of yrs ago)
    GEOLOGIC AGE
      NAME OF ROCK FORMATION
            KIND OF ROCK AND HOW IT IS SCULPTURED BY EROSION
              THICKNESS (feet)
                NAMED FOR OCCURRENCE AT OR NEAR


  150
    Jurassic
      Entrada Sandstone
            Crossbedded white fine-grained sandstone at top (Moab
                  Member); salmon colored to pink, fine-grained,
                  generally crossbedded sandstone in middle (Slick Rock
                  Member); red earthy sandstone and siltstone at base
                  (Dewey Bridge Member, grades into Carmel Formation
                  west of Green River). Forms steep-sided buttes north,
                  east, and west of park.
              400-500
                Entrada Point, San Rafael Swell, Utah
  175
    Jurassic & Triassic(?)
      Glen Can Group
        Navajo Sandstone
            Crossbedded buff to gray sandstone, some red sandstone, and
                  thin beds of limestone. Residual rounded patches on
                  highest mesas.
              325-550
                Navajo Country, Ariz., New Mexico, Utah
    Late Triassic(?)
        Kayenta Formation
            Irregularly bedded stream-laid gray, buff, lavender and red
                  fine-to-coarse-grained sandstone and siltstone. Caps
                  most high mesas and forms tops of highest cliffs.
                  Contains fresh-water fossils.
              160-300
                Glen Canyon, S. Utah, Kayenta, Arizona
  200
    Late Triassic
        Wingate Sandstone
            Buff and light red generally crossbedded medium-grained
                  sandstone. Forms highest cliffs, many of which are
                  coated with black desert varnish.
              210-340
                Ft. Wingate, New Mexico
      Chinle Fm.
        Unnamed upper member
            Reddish siltstone, mudstone, and sandstone locally bleached
                  to bluish or greenish gray, and few thin beds of
                  limestone. Forms steep slopes at base of highest
                  cliffs. Contains some fossil wood and reptile bones.
              205-740
                Chinle Valley, Ariz.
        Moss Back Mbr
            Gray, brown, and gray-green sandstone and conglomerate.
              0-80
                Moss Back Ridge, Utah
  215
    Middle(?) and Early Triassic
      Moenkopi Fm.
        Unnamed upper member
            Brick red, reddish-brown, and brown mudstone and sandstone,
                  and some conglomerate and gypsum. Forms slopes broken
                  by thin ledges.
              250-940
                Moenkopi Wash, Ariz.
    Triassic(?)
        Hoskinnini Tongue
            Pale-brown fine-to-coarse-grained sandstone; forms ledges.
              0-120
                Hoskinnini Mesa, Ariz.
  250
    Permian
      Cutler Fm.
            Undivided Cutler Formation in northeastern part of area is
                  composed of buff, red, and purple arkosic sandstone
                  and conglomerate. South of Indian Creek is the thick
                  Cedar Mesa Sandstone Member, composed of massive
                  mainly crossbedded white to pale red sandstone with
                  thin beds of cherty limestone. Forms needles, arches
                  and other erosional features. Thickening southwestward
                  is the White Rim Sandstone Member of white crossbedded
                  sandstone.
              800-1,000
                Cutler Creek, Colo.
        White Rim Sandstone Member
                White Rim, Wayne Co., Utah
        Organ Rock Tongue
                Organ Rock, Utah
        Cedar Mesa Sandstone Member
                Cedar Mesa, S. E. Utah
      Rico Formation
            Buff, red, and purple arkosic sandstone and conglomerate
                  containing several thin beds of marine fossiliferous
                  limestone. Forms moderately steep slopes.
              250-585
                Rico, Colo.
  300
    Pennsylvanian
      Hermosa Formation
                Hermosa Creek, Animas River Valley, Colo.
        Unnamed upper member
            Blue, greenish, and gray fossiliferous limestone interbedded
                  with white, gray, and greenish sandstone and gray to
                  green shale. Lower part known only from deep wells.
                  Forms steep canyon walls.
              900-1,800
        Paradox Member
            Salt, gypsum, and anhydrite with interbedded black and brown
                  shale; some limestone.
              ?
                Paradox Valley, Colo.


Last but far from least among the factors responsible for the grandeur
of the canyon country is the desert climate, which allows us to see
virtually every foot of the vividly colored naked rocks and has made
possible the creation and preservation of such a wide variety of
fantastic sculptures. A wetter climate would have produced a far
different and smoother landscape in which most of the rocks and land
forms would have been hidden by vegetation. In the canyon lands the
vegetation is mainly on the high mesas and on the narrow flood plains
bordering the rivers, but scanty vegetation does grow on the gentle
slopes or flats.

The desert climate has combined with the nearly flat lying layers of
sediments of different character, hardness, and thickness to produce
steep slopes having many cliffs and ledges and generally sharp to
angular edges rather than the subdued rounded forms of more humid
regions. This has led geologists to refer to such terrain as having
"layer-cake geology," and this is brought out by the profile in the rock
column (fig. 9), by the cross section (fig. 10), by figure 15, and by
many of the other photographs. But the baker of this cake was rather
careless--not only do the layers range widely in thickness and
character, but some are wedge shaped, thick on one side of the cake but
thin or absent on the other. Then too, when he ran out of icing in the
midst of a layer, he was apt to finish with a different kind or color,
for no inspector was on the job to insure orderly construction.

If all the rock strata in the park were present at one locality, their
sequence and thickness would be those shown on the right-hand side of
the graphic section in figure 9. However, because of the lateral changes
in thickness and character and the wedging out of certain beds, such as
the White Rim Sandstone Member of the Cutler Formation, no two sections
of the strata are exactly alike. This will be brought out in photographs
of different exposures of rocks in various parts of the park.

An often-asked question is, why are most of the rocks so red? This can
be answered by one word--iron, the same pigment used in rouge and in
paint for barns and boxcars. Various oxides of iron, some including
water, produce not only brick red but also pink, salmon, brown, buff,
yellow, and even green or bluish green. This does not imply that the
rocks could be considered as sources of iron ore, for the merest trace
of iron, generally only 1 to 3 percent, is enough to produce even the
darkest shades of red. The only rocks in the park that contain virtually
no iron are white sandstones of the White Rim Sandstone Member of the
Cutler Formation (figs. 21-24) and the Navajo Sandstone.

    [Illustration: Fig. 10, first section]

    [Illustration: SECTION ACROSS CANYONLANDS NATIONAL PARK from North
    Point at west (left), via Grand View Point in middle, to Needles
    Overlook at east (right), showing the three principal topographic
    levels and character of the rock strata. Line of section bends at
    Grand View Point, which is northernmost part. (Fig. 10)]

As pointed out by Stokes (1970, p. 3), microscopic examination of the
colored grains of quartz or other minerals shows the pigment to be
merely a thin coating on and between white or colorless particles. Sand
or silt weathered from such rocks soon loses its color by the scouring
action of wind or water, so most of the sand dunes and sand bars are
white or nearly so.

The map (fig. 1) and cross section (fig. 10) of the park show that in
general the major features of the landscape lie at three different and
distinctive levels. A recently erected plaque on Grand View Point
appropriately refers to these levels as the "Three Worlds." The high
plateaus, or mesas, in and adjoining the park dominate the skyline--in
fact, the central one, between the Green and Colorado Rivers, is
appropriately named Island in the Sky. If you stand on either the east
or the west shore of this towering cliff-bordered island, you can look
across a sea of fantastic erosional forms to a similar cliff-bordered
shore at about the same level. Closer inspection of the sea of rocks on
either side shows relatively flat benches or platforms about halfway to
the bottom; below these are the generally steep sided or cliff-bordered
canyons of the two rivers and their larger tributaries. From some
vantage points along the shore, such as Dead Horse Point (fig. 15) or
Green River Overlook (fig. 23), you can see the deepest level of
all--the channels and flood plains of the Green and Colorado Rivers.

What caused the "Three Worlds" and the formidable cliffs supporting the
high mesas or forming towering monoliths like Angel Arch or Druid Arch
(figs. 43, 54)? Differences in the composition, hardness, arrangement,
and thickness of the rock layers determine their ability to withstand
the forces of fracturing and erosion and hence their tendency to form
cliffs, ledges, or slopes. Most of the cliff- or ledge-forming rocks are
sandstones consisting of sand grains deposited by wind or water and
later cemented together by silica (SiO_{2}), calcium carbonate
(CaCO_{3}), or one of the iron oxides (such as Fe_{2}O_{3}), but some
hard, resistant ledges are made of limestone (calcium carbonate). The
rock column (fig. 9) shows in general how these rock formations are
sculptured by erosion and how they protect underlying layers from more
rapid erosion. The nearly vertical cliffs supporting the highest mesas
consist of the well-cemented Wingate Sandstone protected above by the
even harder sandstone of the Kayenta Formation. To borrow from an
earlier report of mine (Lohman, 1965, p. 17),

  Vertical cliffs and shafts of the Wingate Sandstone endure only where
  the top of the formation is capped by beds of the next younger rock
  unit--the Kayenta Formation. The Kayenta is much more resistant than
  the Wingate, so even a few feet of the Kayenta * * * protect the rock
  beneath.

In some places remnants of the overlying Navajo Sandstone make up the
topmost unit of the cliff.

    [Illustration: Petroglyph]




How to See the Park


The question of how to see the park has no simple answer, for the park
is too vast and complex to comprehend by a quick visit to any one of its
many and varied parts or by any one means of transportation. Some, as
did Major Powell, view it only from the rivers--by boat plus a few
back-breaking climbs up the bordering canyon walls. Others see only the
small parts reachable by passenger cars. The more venturesome see vastly
more by jeep, foot, or horseback. And a few prefer to view it as the
birds do--from the air. Many, those who put aside their magazines long
enough, get bird's-eye views without half trying, for Canyonlands is
beneath the principal air routes connecting Los Angeles with Grand
Junction and Denver. Actually, a full appreciation of all the wonders
and beauties of the park is possible only by combining all these
approaches and methods of locomotion, but only a few fortunate souls
such as Bates Wilson have thus been able to inspect virtually every
square foot of it.

The task clearly before me, then, is how best to present such a complex
wonderland to you, the reader. The method I selected, after considerable
thought and a few false starts, is to begin at the top--the high
mesas--and work my way downward much as the rivers have done in carving
out this fantastic area, to some of the broad benchlands beneath the
mesas and eventually to the river channels and deep canyons. Although
the approach I selected may not be the best, and admittedly is but one
of several that comes to mind, I hope it gets the job done.




                             The High Mesas


Even though the "peninsular" mesas east and west of Island in the Sky,
known respectively as Hatch Point and the Orange Cliffs, lie outside the
present boundaries, they provide breathtaking views of important
features within the park, so brief descriptions of them are included
below. But first, let us take a closer look at Island in the Sky.


                           Island in the Sky

As the map (fig. 1) shows, Island in the Sky is really a fork of a
wedge-shaped peninsula extending southward between the two rivers. An
outlier to the south named Junction Butte has already been severed from
the main peninsula by erosion and now is a true island. (See
frontispiece and fig. 22.) A large chunk of Island in the Sky south of
The Neck was about to be severed by erosion from the main peninsula to
become a true island, when recent widening and grading of the road gave
it a temporary reprieve. When my family and I first squeaked over this
narrow neck in 1960 by jeep, furtive glances to right or left showed the
two canyons perilously close, and complete severance seemed imminent.
The road builders have staved off disaster for a few thousand years, but
ultimately the large section to the south will become another island,
and a bridge will be required to connect it to the mainland. Its
appearance from the air before the road widening is shown in figure 11.

    [Illustration: AERIAL VIEW OF THE NECK AND SHAFER TRAIL, looking
    southwest, taken before rebuilding of park road on mesa top.
    Cliff-walled canyon to right of The Neck, in middle, drains westward
    to the Green River; south fork of Shafer Canyon to left drains
    eastward to Colorado River. This is the narrowest part of Island in
    the Sky. Photograph by National Park Service. (Fig. 11)]

The entrance road to Island in the Sky intersects U.S. Highway 163 at a
point 10 miles northwest of Moab, or 21 miles southeast of Crescent
Junction on Interstate Highway 70. From U.S. 163 a paved road climbs
colorful Sevenmile Canyon past sandstone cliffs of the Wingate, Kayenta,
and Navajo Formations to reach the high mesa. There, just "offshore" to
the north, are anchored the "battleships" that guard the
island--Merrimac and Monitor Buttes (fig. 12). These landmarks are
composed of the Entrada Sandstone--the same rock that forms Church Rock
at the entrance to the Needles district (fig. 37) and that shapes the
spectacular arches in Arches National Park. All three members of the
Entrada (Wright and others, 1962), as noted in the figure 12 caption,
are present here as well as at Church Rock. Eleven miles from the
junction with U.S. Highway 163 a graded road to the right, called
Horsethief Trail, goes 16 miles down to the Green River, where it
connects with roads following the river both upstream and downstream.
The road upstream leads to two uranium mines in the lower part of
Mineral Canyon which were reactivated in 1972 and 1973. The switchbacks
are quite spectacular and are reminiscent of the Shafer Trail. Three
miles south of the Horsethief Trail turnoff is a fork in the road--to
the left the pavement continues to Dead Horse Point, and straight ahead
a graded road leads southward to the Island in the Sky district of
Canyonlands National Park.

    [Illustration: MERRIMAC (LEFT) AND MONITOR BUTTES guard north
    entrance to Island in the Sky. White rock near middle is Navajo
    Sandstone. Buttes comprise all three members of Entrada Sandstone:
    remnant white top of Moab Member, vertical cliffs of Slick Rock
    Member, and sloping base of Dewey Bridge Member. (Fig. 12)]

Most of Island in the Sky has a scattered growth of piñon and juniper
trees, but several large flat areas, such as Grays Pasture, contain
sufficient sandy soil to support a mantle of grass and weeds, which is
used for grazing; however, grazing in this part of the park will be
discontinued in 1975.


                      DEAD HORSE POINT STATE PARK

Let us follow the paved road from U.S. Highway 163 all the way to Dead
Horse Point, which was set aside as a state park in 1957. The park has a
visitor center, museum, modern campgrounds and picnic facilities, and
piped water, which is hauled all the way from Moab. An entrance fee of
$1 permits us to drive across the narrow neck to a parking area near the
point proper, which is protected by stone walls and is provided with a
ramada, benches, paths, and sanitary facilities. From Dead Horse Point
we get breathtaking views in several directions, including a loop of the
Colorado River called the Goose Neck, 2,000 feet nearly straight down.

    [Illustration: CANE CREEK ANTICLINE, looking northeast toward the La
    Sal Mountains from Dead Horse Point. Colorado River cuts across
    crest at middle right, above which is Anticline Overlook. (See fig.
    31.) Jeep trail and part of Shafer dome lie below. (Fig. 13)]

How did such a magnificent viewpoint get such a macabre name? Dead Horse
Point was named for a sad but colorful legend concerning a band of wild
horses that once roamed the high mesas. The point is really an embryo
island separated from the mainland by a narrow neck barely wide enough
for the present road. In the early cowboy days the island was used as a
natural corral in which wild mustangs were penned up behind a short
fence across the neck so that the better ones could be sorted out and
driven to mines in the San Juan Mountains of Colorado. A band of horses
corralled too long without water allegedly died of thirst within sight
of the river 2,000 feet below, hence the name of the point, or at least
so one version of the story goes. Some versions allude to the wranglers
as cowboys; others, as horsethieves.

To the northeast we can see the Cane Creek anticline--an upward fold of
the rocks--behind which loom the La Sal Mountains (fig. 13). A cutaway
view of a typical anticline is shown in figure 14. A better view of the
Cane Creek anticline can be seen from Anticline Overlook, as shown in
figure 31. From our vantage point at Dead Horse Point, we can see much
of Hatch Point, including Anticline Overlook, by looking east and
southeast. Spectacular views of the northern part of Canyonlands
National Park lie to the south, southwest, and east. Looking southwest
(fig. 15), we see most of the rock formations exposed in
Canyonlands--more than can be seen from any other vantage point in or
near the park. The names of the visible rock units shown in figure 15
can be compared with the complete list in the rock column (fig. 9).
Parts of Shafer dome, a "closed" rounded anticline, are visible in the
lower left of figure 15 and in the lower right of figure 13. Its general
domelike shape is outlined by the bluish-white Shafer limestone, a
marker bed which also caps the bench on the peninsula within the Goose
Neck of the river. This limestone, which here forms the top of the Rico
Formation, is not shown in the rock column (fig. 9) because its exposure
is limited to the Shafer dome and the Cane Creek anticline and its name
is used only locally by prospectors for oil and gas.

    [Illustration: CUTAWAY VIEW OF ANTICLINE, or upfold of the rocks.
    From Hansen (1969, p. 31). (Fig. 14)]

    [Illustration: LOOKING SOUTHWEST FROM DEAD HORSE POINT toward Island
    in the Sky on right skyline, Orange Cliffs on left skyline, Colorado
    River and White Rim Trail below, and Shafer dome at lower left.
    Sketch from photograph shows names of rocks. (Compare with fig. 9.)
    (Fig. 15)]

    [Illustration: Fig. 15, cont.]

Note that the White Rim Sandstone Member of the Cutler Formation,
referred to hereinafter simply as the White Rim Sandstone, becomes
thinner toward the right (northeast) in figure 15 but is absent entirely
in figure 13, just a short distance to the northeast. The gradual
disappearance of recognizable beds of this type toward the northeast,
including the disappearance of some limestone beds containing marine
fossils, are examples of what geologists call facies changes. Here the
changes result from the fact that while strata were being deposited in
or near ancient seas that lay to the southwest, beds of different
character were being laid down on land by streams emanating from the
northeast. This will be gone into in more detail in discussions that
accompany illustrations to follow, particularly figure 27, fig. 31, and
fig. 35.


                             NORTH ENTRANCE

The north entrance to the Island in the Sky district of Canyonlands
National Park used to be 6 miles south of the junction with the paved
road to Dead Horse Point, but since the land additions of November 1971,
it is only 4-1/2 miles south of this junction. A temporary
trailer-housed entrance station marks the old boundary.


                      SHAFER AND WHITE RIM TRAILS

During the early 1950's a remarkable but hair-raising road known as
Shafer Trail was cut down the face of the cliffs below The Neck to reach
the C Group of uranium claims near the head of Lathrop Canyon. It
branches southward from the park road a mile south of the new entrance,
then descends in a series of switchbacks. The aerial view (fig. 11)
shows the upper trail and The Neck before the park road was graded and
widened, and a view from near The Neck (fig. 16) shows the precipitous
cliffs the trail descends. It follows the general route of an old foot
trail.

    [Illustration: SHAFER TRAIL, from just south of The Neck (fig. 1,
    fig. 11). Navajo Sandstone is above road at left, Kayenta Formation
    forms upper half of cliff below road, and Wingate Sandstone forms
    lower, vertical half of cliff; lower part of road is in Chinle
    Formation. (Fig. 16)]

Shafer Trail connects with the White Rim Trail, which, as the name
suggests, is built mainly on the White Rim, after which the White Rim
Sandstone was named. The White Rim Trail can be followed northeastward
to join the pavement at Potash, or it can be followed southward along
the Colorado River canyons to Junction Butte, thence northward along
Stillwater and Labyrinth Canyons of the Green River to and beyond the
northern boundary of the park. At Horsethief Bottom, you can leave the
canyon by Horsethief Trail and rejoin the paved road leading northward
to U.S. 163. At Lathrop Canyon, 8 or 10 miles south of where Shafer
Trail meets the White Rim Trail, a branch of the White Rim Trail leads
downward to the Colorado River, where picnic tables and sanitary
facilities are provided. This is used as a lunch stop by some boating
groups.

Although some two-wheel-drive cars or trucks have traversed the White
Rim and Shafer Trails, they may encounter trouble with deep sand,
washouts, or fallen rocks, so four-wheel-drive vehicles are recommended.
In the summer these trails should not be attempted without plenty of
water, and two vehicles traveling together provide an added margin of
safety. All vehicles should carry emergency equipment including a
shovel, tow chain or rope, jack, tire tools, and other necessary items.
Geologists and uranium prospectors working along the White Rim Trail
have obtained good drinking water from small springs that flow from the
base of the White Rim Sandstone in many places (Neal Hinrichs, U.S.
Geol. Survey, oral commun., Feb. 1973). After rains, runoff gathers in
large potholes in the White Rim Sandstone in some places and affords
emergency drinking water. Several such potholes filled with water are
shown in figure 17. Some potholes occur also in the Cedar Mesa Sandstone
in the Needles district.


                            GRAND VIEW POINT

About a mile southwest of The Neck, the road crosses Grays Pasture--the
widest and flattest part of Island in the Sky. The drive over this flat
grassland yields not the slightest hint of the awesome cliff-walled
chasms on either side of the island. Some 5 miles southwest of The Neck,
both the island and the road branch like a Y. At a point 0.4 mile north
of the Y, Mesa Trail leads one-quarter mile east to Canyon Viewpoint
Arch, which frames the Colorado River canyon and the La Sal Mountains
(fig. 18). This arch, at the very top edge of the cliff, is composed of
the lower part of the Navajo Sandstone. The only other arch of Navajo
Sandstone in or near the park that I know of is the small one shown in
figure 33, but of course there may be others.

    [Illustration: NATURAL TANKS, filled with runoff from rain, serve as
    emergency sources of drinking water. Largest tank in foreground
    contains 4 feet of water and small fresh-water shrimp. So-called
    tanks, or potholes, are formed partly by water dissolving the
    calcium carbonate cement and partly by wind or water removing the
    resulting loose sand grains. View is north toward Junction Butte
    from point about a mile south of the White Rim Trail. Red rocks in
    hill on right are in lower part of Moenkopi Formation. Photograph by
    E. N. Hinrichs. (Fig. 17)]

    [Illustration: CANYON VIEWPOINT ARCH, framing Colorado River canyon
    at east end of Mesa Trail 0.4 mile north of Y in Island in the Sky
    road. Arch is in lower part of Navajo Sandstone. (Fig. 18)]

    [Illustration: INDEX MAP showing localities where most of the
    photographs were taken. Arrows point to distant views. Numbers refer
    to figure numbers. (Fig. 19)]

    [Illustration: THE WHITE RIM, looking northeast toward La Sal
    Mountains from overlook 3 miles north of Grand View Point. White Rim
    Sandstone here is thicker than near Dead Horse Point (fig. 15) but
    thinner than in Monument Basin and Stillwater Canyon (fig. 21, fig.
    23). (Fig. 20)]

Let us now take the branch south of the Y and follow the narrow crest of
Grand View Point for about 6 miles to the main overlook. About 0.9 mile
south of the Y, a short walk to the west over the lower part of the
Navajo Sandstone affords a magnificent view of Stillwater Canyon of the
Green River, including Turks Head (fig. 23, fig. 24). Half way to the
point is a parking area and overlook, from which we get a spectacular
view of canyons cutting the White Rim and of the La Sal Mountains beyond
(fig. 20). Note that the White Rim Sandstone, which forms the broad
bench appropriately named the White Rim, is here much thicker than where
seen near Dead Horse Point (fig. 15).

    [Illustration: MONUMENT BASIN FROM GRAND VIEW POINT, Needles
    Overlook on left skyline, Abajo Mountains on right skyline. Red
    spires and cliffs in basin are Organ Rock Tongue of Cutler
    Formation. (Fig. 21)]

Three more miles southward takes us to Grand View Point and its nearby
picnic area. Though named after the former Grand River some 2,000 feet
below, Grand View Point has a double meaning, for we see from here a
truly grand view (fig. 21)! At our feet is spectacular Monument Basin,
cut below the White Rim into the brick-red Organ Rock Tongue of the
Cutler Formation. The White Rim Sandstone here is slightly thicker than
to the northeast (fig. 20) but thinner than to the west (fig. 23),
because it forms a wedge-shaped body that thickens westward. In the
distance southeastward are the Abajo Mountains, just west of Monticello,
Utah. The prominent projection on Hatch Point on the left skyline is
Needles Overlook, from which the photograph in figure 27 was taken. A
closeup view of Monument Basin, showing Junction Butte and Grand View
Point in the background, is shown in figure 22. The slender spire in the
foreground has a measured height of 305 feet (Findley, 1971, p. 78).

    [Illustration: MONUMENT BASIN FROM THE AIR, looking north to
    Junction Butte and Grand View Point. Spire of Organ Rock Tongue in
    foreground is 305 feet high. White top of Cedar Mesa Sandstone is at
    bottom of photograph. Photograph by National Park Service (Fig. 22)]


                          GREEN RIVER OVERLOOK

About a quarter mile west of the Y, a left fork of the road goes about a
mile and a half to Green River Overlook, which provides a superb view of
Stillwater Canyon of the Green River, the Orange Cliffs beyond, and the
Henry Mountains in the extreme distance (fig. 23). Note that here the
White Rim Sandstone is much thicker than in preceding views. The
prominent butte enclosed by the loop of the river is known as Turks Head
and is better seen from the air (fig. 24). The light-colored band near
the base of the cliffs in the background of figure 24 is characteristic
of the bleached upper part of the Moenkopi Formation in this part of the
park. According to F. A. McKeown and P. P. Orkild (U.S. Geol. Survey,
unpub. data, Feb. 16, 1973), petroliferous material or odor generally
occurs in this bleached zone and in the basal beds of the Moenkopi.

The campground just north of Green River Overlook has no water at this
writing (1973), but water from wells in Taylor Canyon will eventually be
piped to nearby parts of Island in the Sky.


                             UPHEAVAL DOME

Five miles northwest of the Y we come to Upheaval Dome, one of the most
unusual geographic and geologic features of the park. Viewed from the
air (fig. 25), it resembles somewhat a volcanic or meteor crater and has
been called such by some. Because beds of salt are known to underlie the
park, some have suggested that the salt may have thickened and welled
upward to form a salt dome, similar to domes along the Gulf Coast
(Mattox, 1968). However, only 1,470 feet of salt was encountered in an
oil test just east of Upheaval Dome (Robert J. Hite, U.S. Geol. Survey,
oral commun., Feb. 13, 1973); so although salt may have played a role,
Upheaval Dome clearly is not a salt dome with dimensions similar to the
Gulf Coast types. It may be related to a mound on the deep-seated
Precambrian rocks (Joesting and Plouff, 1958, fig. 3; Joesting and
others, 1966, p. 13, 14, 17), but the exact origin of the dome is not
clear.

The central part has the structure of a dome, in that the strata dip
downward away from the middle. A ringlike syncline, or downward fold in
the rock layers (fig. 26), surrounds the dome, beyond which the strata
resume their nearly flat position. The white rock in the bottom of the
craterlike depression is not salt, but jumbled large fragments of the
White Rim Sandstone. Surrounding that are slopes of the Moenkopi and
Chinle Formations, cliffs of the Wingate Sandstone, a circular bench of
the Kayenta Formation, and outer ramparts of the Navajo Sandstone.
Upheaval Canyon leads to Stillwater Canyon of the Green River at the
upper left.

    [Illustration: STILLWATER CANYON AND GREEN RIVER, looking southwest
    from Green River loop of river. Brown material covering nearby parts
    of the White Rim is lower part of Overlook. Orange Cliffs in
    background, Henry Mountains on right skyline, Turks Head in Moenkopi
    Formation. (Fig. 23)]

    [Illustration: TURKS HEAD, an erosional remnant of the White Rim
    Sandstone supported by red beds of Organ Rock Tongue, in loop of
    Green River. Aerial view looking north. Photograph by National Park
    Service. (Fig. 24)]

    [Illustration: UPHEAVAL DOME, aerial view looking northwest toward
    junction of Upheaval and Taylor Canyons with Labyrinth Canyon of
    Green River. Photograph by Walter Meayers Edwards, © 1971 National
    Geographic Society. (Fig. 25)]

    [Illustration: CUTAWAY VIEW OF SYNCLINE, or downfold of the rocks.
    From Hansen (1969, p. 108). (Fig. 26)]

One mile before the road ends, a well-marked foot trail leads to the top
of Whale Rock, a prominence on the Navajo Sandstone that forms the outer
ring of the dome. At the end of the road, another foot trail ascends
from the picnic area to the foot of the Wingate Sandstone cliffs around
the central part of the dome. The views of the dome from these trails
are interesting, but you are really too close to get a true picture of
the unusual feature, which is obtainable only from the air, as shown in
figure 25.

Just west of Upheaval Dome, Bighorn Mesa is connected to Steer Mesa by a
neck only 15 feet wide flanked by 300-foot vertical cliffs, as pointed
out by McKnight (1940, p. 12). I later learned from Ed McKnight (oral
commun., June 6, 1973) that during his field work in this area in 1926
he was riding a mule across this narrow neck when the half-asleep mule
suddenly became aware of the dropoff on one side and began to turn
around and head back. Ed hastily but cautiously dismounted and led the
mule across! When this neck is finally breached by erosion, Bighorn Mesa
will be just as isolated and inaccessible as Junction Butte, now cut off
from Grand View Point. (See frontispiece and fig. 27.)


                              Hatch Point

The high mesa east of Canyonlands National Park and the Colorado River
canyons, called Hatch Point, contains several vantage points ideally
suited for viewing scenic features of the park and adjacent areas. Hatch
Point is part of the vast public domain administered by the Bureau of
Land Management--a sister agency of the Geological Survey and the
National Park Service, all in the U.S. Department of the Interior. The
Bureau, hereinafter referred to simply as the B.L.M., has made many
improvements on Hatch Point, including fine roads, two modern
campgrounds with sanitary facilities and piped water from wells, and two
overlooks with protective fences, benches, paths, sanitary facilities,
and ramadas containing panels that describe the features visible from
the viewpoints. Because of these improvements, the B.L.M. has
appropriately named this area "Canyon Rims Recreation Area."

Geologically, Hatch Point is similar to Island in the Sky. Both are
bordered by towering cliffs of the Wingate Sandstone capped by the
resistant Kayenta Formation, and rounded remnants of the overlying
Navajo Sandstone rise above the otherwise-flat mesa surface in many
places.

Access to this high tableland is by a good paved road leading west from
U.S. Highway 163 at a point 32 miles south of Moab and 22 miles north of
Monticello. About 5 miles west of the highway we pass Windwhistle
Campground, nestled in an attractive cove of Entrada Sandstone cliffs,
and 16 miles from the highway we reach an intersection. From here it is
7 miles west by paved road to Needles Overlook, 10 miles north to
Anticline Overlook. Like the other high mesas, Hatch Point contains
peripheral areas of scattered piñon and juniper trees and large flat
grasslands used for grazing. Grain tanks here and there store winter
feed for the cattle.


                            NEEDLES OVERLOOK

Let us follow the pavement to Needles Overlook, from which fine morning
views of Canyonlands National Park can be seen to the south and west.
Northwestward (fig. 27) we look 10 miles across the Colorado River
canyon to Junction Butte and Grand View Point. (This view is along the
line of the east half of the cross section in fig. 10.) The feather edge
of the White Rim Sandstone caps the White Rim west of the Colorado
River, but the White Rim is absent on the east side of the canyon and in
the entire Needles district to the southwest, where the important scenic
features are carved from the underlying Cedar Mesa Sandstone Member of
the Cutler Formation, referred to hereinafter simply as the Cedar Mesa
Sandstone. Both these sandstones are missing in the foreground of figure
27--their place being taken by thin beds of red siltstone, mudstone, and
sandstone similar to those that comprise the Organ Rock Tongue shown
between the two sandstones in figure 22. These are additional examples
of facies changes mentioned earlier (p. 34).

    [Illustration: JUNCTION BUTTE AND GRAND VIEW POINT, looking
    northwest from Needles Overlook. (Fig. 27)]


                          CANYONLANDS OVERLOOK

Turning north from the intersection 7 miles east of Needles Overlook, we
traverse a nearly flat grassy tableland to Hatch Point Campground. In
figure 1 the campground is shown west of the old road; the new road is
west of the campground, but no map of the new route was available for
plotting in figure 1. About a mile before we reach the campground a jeep
trail heads west then northwest about 5-1/2 miles to Canyonlands
Overlook, a scant mile from, but some 1,400 feet above, the eastern
border of Canyonlands National Park. This overlook affords fine views of
the Colorado River canyons and the eastern shore of Island in the Sky,
but at present (1973) there are no plans to improve the trail for
passenger-car travel.

Two miles north of the campground we cross a minor drainage leading
northeastward into the north fork of Trough Springs Canyon. The B.L.M.
plans a road down this canyon to Kane Springs Canyon, 1,100 feet below,
where it will connect both with a scenic drive to Moab, the lower part
of which is paved, and with the jeep trail going west over Hurrah Pass
(fig. 30) and thence south along the eastern benches of the canyons of
the Colorado River to the Needles district of the park. E. Neal Hinrichs
(U.S. Geol. Survey, oral commun. Feb. 16, 1973) reported specimens of
blue celestite (strontium sulfate, SrSO_{4}) and barite (barium sulfate,
BaSO_{4}) in the Cutler Formation at a point where a sharp bend of this
jeep trail crosses a fault, or fracture (fig. 56), in the northeast fork
of Lockhart Canyon (shown in fig. 1 as the easternmost loop of the trail
about 6 miles northeast of Lockhart Basin). Farther south, the trail
swings west of Lockhart Basin, whose center exposes part of a syncline
(fig. 28).

    [Illustration: SYNCLINE IN CORE OF LOCKHART BASIN, near Needles
    Overlook. Dish-shaped roof is Wingate Sandstone, partly bleached;
    sloping sides are Chinle Formation; dark sloping ledge at left
    middle ground is Moss Back Member of Chinle resting on Moenkopi
    Formation. Photograph by E. N. Hinrichs. (Fig. 28)]


                                U-3 LOOP

Two and a half miles farther north, or about 2 miles south of Anticline
Overlook, a short road leads to the west and entirely around a small
conical butte of the Navajo Sandstone. This new circular drive has not
yet been formally named and is simply called the U-3 loop, as designated
in the surveyor's notebook. It affords splendid views to the west and is
to be equipped with picnic tables. Looking west (fig. 29) we see a
W-shaped loop of the Colorado River, Dead Horse Point on the right
skyline, and Island in the Sky on the distant skyline. The strata
curving over Shafer dome appear in the right middle background.

    [Illustration: VIEW WESTWARD FROM U-3 LOOP. Dead Horse Point on
    right skyline, Island in the Sky capped by Navajo Sandstone in
    extreme distance, Kayenta Formation in foreground at left. Cliffs
    topping ridge at left are Wingate Sandstone protected by caprock of
    the Kayenta Formation; red slopes beneath cliffs are Chinle
    Formation, with dark ledge of Moss Back Member at base; steep slopes
    and ledges beneath are Moenkopi Formation, lower part of which is
    Hoskinnini Tongue; reddish gentle slopes below are Cutler Formation;
    nearly flat benches above Colorado River are Rico Formation, with
    Shafer limestone at top. (Fig. 29)]


                           ANTICLINE OVERLOOK

Two more miles takes us to Anticline Overlook for the most sublime views
in this part of the area. To the north (fig. 30) we look across the
northeast flank of the Cane Creek anticline, an upfold of the rocks
(figs. 13, 14). Hurrah Pass straddles the narrow wall separating the
Colorado River and its canyon at the left from Kane Springs Canyon on
the right. The Colorado River appears again in the right background,
where it leaves Moab Valley. The Kings Bottom syncline, or downfold
(fig. 26), seen in the middle distance between the Cane Creek anticline
and the Moab anticline, exposes a wide area of the Navajo Sandstone. The
ridge on the right skyline, composed of the Entrada Sandstone, is The
Windows Section of Arches National Park, and the left skyline shows
faintly the distant Book Cliffs.

On the east wall of Kane Springs Canyon just to the right of figure 30
is the Atomic King mine in the Cutler Formation, from which uranium ore
has been mined at intervals during the last 2 or 3 years.

    [Illustration: LOOKING NORTH FROM ANTICLINE OVERLOOK, across axis of
    Cane Creek anticline. Unimproved road crosses Hurrah Pass in
    foreground. Colorado River at left is near Potash and in right
    background is at Moab. For description of strata, see caption for
    figure 31. (Fig. 30)]

    [Illustration: CANE CREEK ANTICLINE, looking northwest from
    Anticline Overlook. Colorado River is cutting into limestone of
    unnamed upper member of Hermosa Formation in lower bench at crest of
    fold; Rico Formation, with bluish-white Shafer limestone at top,
    forms upper curved bench; remainder of formations are as given in
    caption for figure 29. Potash mine (right) and evaporation ponds
    (left) are operated by Texas Gulf, Inc. Merrimac and Monitor Buttes
    on right skyline are shown in figure 12. (Fig. 31)]

To the northwest (fig. 31; see also fig. 13) is a textbook example of a
rock fold--the Cane Creek anticline--laid bare by the Colorado River
cutting directly across its crest (fig. 1). Anticlines are noted as
sources of or at least hunting grounds for oil and gas, and this one is
no exception, although production has been relatively small and was
stopped altogether in about 1963. Some oil and gas was produced also
from wells on the north flank of Shafer dome, just beneath Dead Horse
Point (figs. 1, 15), but other favorable-looking structures farther
south that were tested, such as Lockhart anticline, Rustler dome, and
Gibson dome (fig. 1), failed to yield commercial amounts (Baker, 1933,
p. 80-84). Some of the colorful events in the early days of wildcatting
are noted on page 100.

Exploration for oil and gas led to the discovery of potash beneath
several anticlines in eastern Utah and western Colorado. According to
Hite (1968, p. 325), the Cane Creek anticline is underlain by about
5,200 feet of salt-bearing rocks in the Paradox Member of the Hermosa
Formation (fig. 9), of which about 84 percent is halite (common salt,
sodium chloride) and associated potash salts (sylvite, potassium
chloride). The potash mine of Texas Gulf, Inc., is shown at the right in
figure 31. The white area to the left of the mine is waste common salt,
which is recovered with the potash salts, and the white area with dark
stripes at the left is a small part of more than 400 acres of
evaporation ponds built to separate the salts. These ponds also can be
seen from Dead Horse Point. The dark stripes are the visible parts of
plastic membranes lining the ponds. Mining of an 11-foot bed of ore
began by usual underground methods from the bottom of a shaft 2,788 feet
deep but became too difficult because of intense and intricate folding
of the salt beds. Now the salts are being extracted by a method
involving solution, wherein river water is introduced into the former
workings and allowed to stand long enough to dissolve the salts, then
the brine is pumped out to evaporation ponds, and the valuable potash
salts are separated from the sodium salts. Closeup views of the mine and
evaporation ponds are seen in figures 70 and 71.

As noted earlier, most of the readily recognizable thin beds, such as
the White Rim Sandstone, pinch out south of here, and figure 31 marks
the northeasternmost exposure of the Shafer limestone at the top of the
Rico Formation. Northeast from here the Rico and overlying Cutler
Formation are not readily separable and are included in the so-called
Cutler Formation undifferentiated. This land-laid unit of red sandstone,
siltstone, and shale is as much as 8,000 feet thick just southwest of
the ancient Uncompahgre highland (present Uncompahgre Plateau, in
western Colorado and eastern Utah), from which it was derived by erosion
during the Permian Period (fig. 80).


                             Orange Cliffs

The high mesas west of Canyonlands National Park do not form as distinct
a mainland as does Hatch Point, but rather are broken up into a maze of
peninsulas and islands, as shown in figure 1. Owing to the gentle
northwestward dip of the rock strata, the altitude of the mesas declines
from about 7,000 feet in the south to about 5,300 feet in the north and
northwest, where the whole aspect of the country becomes more rounded
and subdued. As shown on the map (fig. 1), however, the name Orange
Cliffs is applied to much of the eastward-facing cliffs, which are made
of the Wingate Sandstone capped by the Kayenta Formation. Remnants of
the Navajo Sandstone increase in number to the north and west, where
remnants of the next two younger rock units--the Carmel Formation and
the Entrada Sandstone--also occur. Thus, the cliff-forming units dip
downward beneath younger rocks that form the relatively flat Green River
Desert to the northwest, also referred to as the San Rafael Desert.
Figure 32 is a view southeastward from The Spur, shown on the map (fig.
1) as the northern section of the Orange Cliffs.

At present (1973), the areas west of the Green River and the main stem
of the Colorado River are the least accessible of any in the park and in
this respect have not changed much since Butch Cassidy and his Wild
Bunch roamed the area, except that the former main horse trails are now
jeep trails. A secondary road south from the town of Green River goes
past the north side of the Horseshoe Canyon Detached Unit (figs. 1, 2)
and connects with another secondary road to the west, which joins Utah
Highway 24 at Temple Junction, 20 miles north of Hanksville; near
Horseshoe Canyon a jeep trail leads south to the Orange Cliffs. Owing to
blowing sand, these "roads" are not considered reliable for passenger
cars and are best negotiated by four-wheel-drive vehicles or horses.

    [Illustration: VIEW SOUTHEASTWARD FROM THE SPUR, in northern section
    of Orange Cliffs. Junction Butte and Grand View Point on left
    skyline; Abajo Mountains in extreme distance to right of center.
    Photograph by Parker Hamilton, Flagstaff, Ariz. (Fig. 32)]

    [Illustration: LOOKING NORTH DOWN MILLARD CANYON from head of canyon
    a mile northwest of French Spring. Note small arch or window in the
    Navajo Sandstone at upper left, which is shown in figure 1 as
    "Arch." The Navajo is underlain by the cliff-forming Kayenta
    Formation and Wingate Sandstone resting upon a sloping base of the
    Chinle Formation and, farther downstream, ledges and slopes of the
    Moenkopi Formation. Photograph by Parker Hamilton, Flagstaff, Ariz.
    (Fig. 33)]

According to Baker (1971, p. 12), the road leading eastward along North
Point was used by the Wild Bunch in traveling to French Spring, whence
they dropped down Millard Canyon (fig. 33) and crossed the Green River
at Bonita Bend, which is just east of Buttes of the Cross (fig. 64).
They also followed the Old Spanish Trail from the Henry Mountains
eastward across the Dirty Devil River, up North Hatch Canyon, across
Sunset Pass, and down across the Land of Standing Rocks to Spanish
Bottom on the Colorado River (fig. 1). After crossing the river, they
followed the trail up Lower Red Lake Canyon (fig. 59) and eastward
through The Needles to Monticello.

    [Illustration: Petroglyph]




The Benchlands


The White Rim, a broad benchland some 1,000-1,200 feet below the
southern half of Island in the Sky, and some of the associated
benchlands west of the Green River and between the Colorado River and
Hatch Point have already been discussed as viewed from Island in the
Sky, the White Rim Trail, or Hatch Point. There remain for consideration
several other prominent benchlands.


                  The Maze and Land of Standing Rocks

The Maze, an intricately carved series of canyons and gullies, has been
called a "Thirty-square-mile puzzle in sandstone" (Findley, 1971, p.
71-73), and one can readily visualize a king-sized rat struggling in
vain to find a way out. The rock is the Cedar Mesa Sandstone, which here
underlies red shales beneath the White Rim Sandstone. South of The Maze
an area containing tall spires was appropriately named by the Indians
"_Toom'-pin wu-near' Tu-weap'_," or "Land of Standing Rocks" (Powell,
1875, p. 154).

West of The Maze is Elaterite Basin, so named because of a dark-brown
elastic mineral resin called elaterite, which seeps from the White Rim
Sandstone. One of these seeps is shown in figure 34, and a wedge-shaped
layer of the sandstone is shown in figure 35. In the Range Canyon area
shown in figure 35, sand was being laid down in an offshore bar at the
left, while red silts and muds were being deposited on land to the
right. The dark bed just above the White Rim near the middle of the
photograph is the Hoskinnini Tongue of the Moenkopi Formation, which
intertongues with and pinches out in beds of the Moenkopi Formation to
left. These are excellent examples of what geologists call facies
changes.

South of the Land of Standing Rocks are equally colorful areas known as
The Fins and Ernies Country (named after Ernie Larson, an early-day
sheep man). A prominent row of spires near Cataract Canyon is known as
The Doll House (fig. 36).

    [Illustration: ELATERITE SEEPING FROM WHITE RIM SANDSTONE in
    Elaterite Basin west of The Maze. Elaterite is a dark-brown elastic
    mineral resin. Photograph by Donald L. Baars. (Fig. 34)]

    [Illustration: WHITE RIM SANDSTONE in north wall of Range Canyon,
    south of Elaterite Basin. Bed thins from 230 feet at left (west) to
    38 feet at right (east), and disappears (by facies change into red
    shales) a short distance farther east. See description in text of
    pinch out of Hoskinnini Tongue. Bed at top of mesa is Moss Back
    Member of Chinle Formation. Photograph by Donald L. Baars. (Fig.
    35)]

    [Illustration: THE DOLL HOUSE, eroded from Cedar Mesa Sandstone just
    west of Spanish Bottom, above Cataract Canyon. Notice the red layer
    at right offset by a fault. Photograph by Parker Hamilton,
    Flagstaff, Ariz. (Fig. 36)]


                          The Needles district

The Needles district is currently (1973) the most highly developed part
of the unfinished park as the result of design, not accident, for this
district includes the greatest number and widest variety of spectacular
features--The Needles proper, The Grabens (pronounced gräbens), colossal
arches and other erosional forms, large meadows such as Squaw Flat and
Chesler and Virginia Parks, a wide variety of prehistoric ruins and
pictographs, and Confluence Overlook for viewing the joining of two
mighty rivers--the Green and the Colorado. Like the White Rim and The
Maze, the Needles district is another of the broad benchlands about
midway between the high mesas and the deep canyons.

Utah Highway 211, as mentioned already, is a 38-mile-long paved road
leading to the Needles district from U.S. Highway 163 at a point 15
miles north of Monticello and 18 miles south of La Sal Junction. The
intersection is well marked by Church Rock (fig. 37), a butte of the
Entrada Sandstone. Highway 211 gradually climbs an eastward-dipping
slope of the Navajo Sandstone dotted with a few buttes and patches of
the Entrada Sandstone, such as Church Rock, and reaches the first of two
summits 3 miles west of Highway 163. The road crosses a broad gentle
valley in the Navajo Sandstone, reaches the second summit about 10 miles
from the highway, then descends steeply through the Navajo Sandstone and
part of the Kayenta Formation to Indian Creek, 1-1/2 miles below, and
follows this creek nearly to The Needles. Half a mile down the canyon
takes us to the top of the cliff-forming Wingate Sandstone, and another
half mile brings us to Indian Creek State Park and its striking
Newspaper Rock (fig. 5). Another 1-3/4 miles takes us to the base of the
Wingate and top of the underlying Chinle Formation, which forms the red
slope beneath the cliffs.

Historic Dugout Ranch (p. 14) is 19 miles west of the highway, and from
here a dry-weather road leads southward up north Cottonwood Creek 37
miles to Beef Basin and connects with roads to Elk Ridge and the Bears
Ears, both just west of the Abajo Mountains. Just west of the ranch we
get a good view ahead of two historic landmarks--North and South
Six-Shooter Peaks (fig. 38), so named because of their resemblance to a
pair of revolvers pointing skyward. The guns are sculptured from slivers
of Wingate Sandstone resting upon conical mounds of the Chinle. These
can be seen from a wide area; both appear in figures 38 and 40, and the
north one is seen in figure 77.

    [Illustration: CHURCH ROCK, standing guard at the intersection of
    U.S. Highway 163 and the east end of Utah Highway 211 leading to the
    Needles district. Rock is Entrada Sandstone: red foundation is Dewey
    Bridge Member; yellowish smooth rounded body of church is Slick Rock
    Member; white steeple is Moab Member. La Sal Mountains at left.
    (Fig. 37)]

    [Illustration: NORTH AND SOUTH SIX-SHOOTER PEAKS, looking west from
    entrance road to The Needles. (Fig. 38)]

A mile west of Dugout Ranch we descend to the top of the Moss Back
Member of the Chinle, a ledge of gray-green sandstone forming the base
of this generally red formation, and reach the base of the member at the
top of the Moenkopi Formation in the next mile and a half. The Moss Back
is uranium bearing in nearby areas.

At 3.8 miles west of Dugout Ranch a poorly marked road on the left
crosses Indian Creek, then forks; the left-hand fork follows the bed of
Lavender Canyon, and the right-hand fork goes into Davis Canyon.
Headwaters of both these canyons are new additions to the park.

The red Organ Rock Tongue of the Cutler Formation is seen about 3 miles
beyond the turnoff, or about 6 miles west of Dugout Ranch. Another 1-1/2
miles takes us down in the rock column (fig. 9) to the top of the Cedar
Mesa Sandstone. The White Rim Sandstone, which forms such a prominent
bench around the southern part of Island in the Sky (figs. 20-23) and
west of the Green River, is missing from the Needles district, its place
in the rock column being taken by red shales and sandstones of the
Cutler Formation. South of Indian Creek other underlying red beds of the
Cutler are gradually replaced in turn by the thick Cedar Mesa Sandstone.
Erosion has reduced the general level of the Needles district to or into
the Cedar Mesa Sandstone, but many streams have cut into the underlying
Rico Formation, and the Colorado River has cut also into, and in places
through, the limestones of the unnamed upper member of the Hermosa
Formation. Our first view of The Needles is another 4 miles, and 1 more
mile takes us to the park boundary, nearly 32 miles from the U.S.
Highway 163. We pass a road on the right leading to Canyonlands Resort,
and on the left is a new line camp which replaces the restored one at
Cave Spring (fig. 6).

The unusual features of the Needles district are due in some part to the
character and thickness of the underlying rocks but in large part to
erosion along joints and faults. Joints are fractures along which no
displacement has taken place, and faults are fractures along which there
has been displacement of the two sides relative to one another (fig.
76). The Cedar Mesa Sandstone comprises 500 to 600 feet or more of hard
well-cemented buff, white, and pink beds of massive sandstone. On the
basis of the type and amount of deformation and erosion of the Cedar
Mesa Sandstone and underlying rocks, the Needles district can be divided
into three differing areas: (1) an eastern area where the rocks are
relatively undeformed but are carved into an intricate series of
canyons, including Salt Canyon and the upper reaches of Davis and
Lavender Canyons--the section of the district that contains most of the
arches and Indian ruins; (2) The Needles proper, where tensional forces
have cracked the brittle Cedar Mesa Sandstone into a crazy-quilt pattern
of square to rectangular blocks separated by joints widened by erosion,
creating a myriad of spires and pinnacles; and (3) The Grabens, where
the previously jointed rocks were later subjected to additional
tensional forces that produced a series of nearly parallel faults that
trend northeastward and separate downdropped blocks of rock, called
grabens, from intervening stationary or upthrown blocks of rock, called
horsts.

Let us examine each of these areas in the order named. For traveling to
most features a four-wheel-drive vehicle is strongly recommended. Some
visitors negotiate the jeep trails with dune buggies or motorcycles, but
four-wheel-drive vehicles are considered safer and generally more
reliable. A few trails can be traveled only on foot.

Squaw Flat, in the western part of the relatively undeformed area, is a
nearly flat area of lower Cedar Mesa Sandstone covered here and there by
a thin layer of sparsely vegetated soil and surrounded by generally low
hilly erosional forms in the upper part of the sandstone. Short canyons
and alcoves in the sandstone hills along the west side afford excellent
semi-private campsites, each of which has its own paved access road,
picnic table, and trash can (fig. 39). Moreover, ground water at shallow
depth in the underlying sandstone has encouraged the growth of
exceptionally large piñon and juniper trees that provide welcome shade.

    [Illustration: SQUAW FLAT CAMPGROUND, in the Needles district, in
    Cedar Mesa Sandstone. Large piñon and juniper trees draw ground
    water from this sandstone. (Fig. 39)]


                   SALT, DAVIS, AND LAVENDER CANYONS

A glance at the southeast corner of the map (fig. 1) shows that most of
the arches and prehistoric ruins in the park are in Salt Canyon and its
main tributary, Horse Canyon. A few are in adjacent Davis and Lavender
Canyons, whose headwaters were recently annexed to the park. These
canyons are accessible only by negotiating the streambeds on
four-wheel-drive vehicles, horseback, or foot. Salt or Horse Canyons are
best conquered by four-wheel-drive vehicles plus short hikes in the
northern part and long hikes in the southern part.

An aerial view (fig. 40) eastward across Salt Canyon shows that erosion
has produced an intricate series of meandering canyons separated by
rather narrow walls of the Cedar Mesa Sandstone, resembling somewhat The
Maze, west of the Green River.

    [Illustration: AERIAL VIEW EASTWARD ACROSS SALT CANYON. Note narrow
    walls and pinnacles between canyons and alcoves. Six-Shooter Peaks
    are in left background. Photograph by Wayne Alcorn, National Park
    Service. (Fig. 40)]

The massive sandstone beds of the Cedar Mesa are composed of sand grains
cemented together by calcium carbonate (CaCO_{3}), which also forms the
mineral called calcite and the rock known as limestone. Limestone and
calcite are soluble in acid, even weak acid such as carbonic acid
(H·HCO_{3}), formed by solution of carbon dioxide (CO_{2}) in water.
Ground water, found everywhere in rock openings at differing depths
beneath the surface, contains considerable dissolved carbon dioxide
derived from decaying organic matter in soil, from the atmosphere, and
from other sources. Even rain water and snow contain small amounts
absorbed from the atmosphere--enough to dissolve small amounts of
limestone or of calcite cement in sandstone. The calcite cement in the
Cedar Mesa and many other sandstones is unevenly distributed, so the
cement is removed first from places that contain the least amounts, and
once the cement is dissolved, the loose sand grains are carried away by
gravity, wind, or water. Thus, relatively thin walls of sandstone
containing irregularly distributed patches of soluble cement are prime
targets for the formation of potholes (fig. 46), alcoves, and caves.
Once a breakthrough occurs, weakened chunks from the ceiling tend to
fall off, and arches of various shapes are produced, because an arch is
naturally the strongest form that can support the overlying rock load.
Man, from the ancient Greeks, Romans, and Egyptians to modern day, has
long made use of arches in building bridges, aqueducts, temples,
cathedrals, and other enduring edifices. All the spectacular arches we
are about to see were carved from the Cedar Mesa Sandstone.

Let us begin our tour of Salt and Horse Canyons by driving a
four-wheel-drive vehicle eastward from the fine campground at Squaw
Flat. After about a mile we pass the Wooden Shoe (fig. 41) capping a
ridge south of the highway; it contains one of the smallest arches we
will encounter. Three quarters of a mile east of the temporary ranger
station we come to Cave Spring, an old restored cowboy line camp
pictured in figure 6. This and an adjacent cave containing a spring are
part of the interesting well-marked Environmental Trail, well worth the
half hour or so it requires.

    [Illustration: WOODEN SHOE, near temporary ranger headquarters, the
    Needles district. Carved in Cedar Mesa Sandstone. (Fig. 41)]

The jeep trail up Salt Canyon lies mostly in the sandy bed of Salt Creek
but includes a few shortcuts across goosenecks and some rough rocky
stretches around rapids or waterfalls. It is best traveled when the
canyon bottom is moist but not soaked. When the sand is soft and dry, a
shift into four-wheel drive is generally necessary. Signs warn of
quicksand, which occurs when the sand is fully saturated; hence, summer
thundershowers sometimes require delaying or postponing the trip. When
in doubt, consult a park ranger for expected weather and trail
conditions. Thundershowers sometimes occur so suddenly and violently as
to cause serious floods, and the "road" is closed when heavy rain is
expected. However, if an unexpected storm occurs while you are up in the
canyon, try to reach high ground and wait until the flood subsides. If
you do not have time to get your vehicle out of the flood's path, at
least get yourself and passengers to a safe spot.

    [Illustration: PAUL BUNYANS POTTY, on east wall of Horse Canyon.
    (Fig. 42)]

Two and a half miles south of Cave Spring we reach the confluence with
Horse Canyon, marked by a sign at the Y giving distances to points of
interest up each canyon. Let us try Horse Canyon first. After about a
mile we pass Paul Bunyans Potty on the left--one of the most aptly
titled features of the park (fig. 42). Two miles south of the Y is
Keyhole Ruin, nestled in a cleft high on the cliff to our left--a
granary built by the Anasazi. Here we face another Y. The left fork
leads half a mile east to Tower Ruin (fig. 4), one of the largest and
best preserved Anasazi granaries in the park. The right fork takes us on
up Horse Canyon, and in about 2 miles we pass Gothic Arch on the right.
In 2 more miles, 4 miles from Salt Canyon, a short hike up the tributary
to the right leads to Castle Arch and Thirteen Faces. Assuming we have
taken photographs of the important features along the way, it probably
is about time to return to camp at Squaw Flat, unless we choose to spend
the night at Peek-a-boo Spring and primitive campground in Salt Canyon,
about 1.2 miles above the confluence with Horse Canyon.

Another drive takes us up Salt Canyon 8-1/2 miles past the confluence
with Horse Canyon to another confluence and Y, which has a primitive
campsite without water. One mile up the left, or southeast, tributary is
a parking area where we begin the 1/2-mile walk to Angel Arch,
considered by many people to be the most beautiful and spectacular arch
in the park if not in the entire canyon country. Angel Arch was drawn
for the front cover by John R. Stacy and is pictured in figure 43.

    [Illustration: Petroglyph]

    [Illustration: ANGEL ARCH, along tributary of Salt Canyon. (Fig.
    43)]

    [Illustration: FISHEYE ARCH, along upper Salt Canyon, looking north.
    Photograph by National Park Service. (Fig. 44)]

From the last Y we can proceed only about 2-1/2 miles farther up main
Salt Canyon by vehicle, and the remaining features shown on the map
(fig. 1) can be reached only on foot. The All American Man, a unique
pictograph referred to earlier (fig. 3), is about 3-1/2 miles up the
canyon. Those hardy souls who wish to hike many additional miles to the
head of Salt Canyon will be rewarded with views of four additional
arches and several ruins. Two of these arches are shown in figures 44
and 45.

The more adventuresome may wish to explore upper Lavender and Davis
Canyons by driving up the sand washes in a four-wheel-drive vehicle, but
inquiry should be made from a park ranger regarding access to the canyon
mouths and condition of the washes. Hand Holt Arch (fig. 46) and Cleft
Arch (fig. 47) are two of the rewarding sights in Lavender Canyon, and
figure 48 shows one of the arches in Davis Canon.

    [Illustration: WEDDING RING ARCH, along upper Salt Canyon.
    Photograph by National Park Service. (Fig. 45)]

    [Illustration: HAND HOLT ARCH, in Lavender Canyon. Note holes in
    sandstone formed by solution and wind scour. Photograph by National
    Park Service. (Fig. 46)]

    [Illustration: CLEFT ARCH, in upper Lavender Canyon, looking north.
    Photograph by E. N. Hinrichs. (Fig. 47)]

    [Illustration: ARCH, in upper Davis Canyon, looking northwest.
    Photograph by E. N. Hinrichs. (Fig. 48)]


                      THE NEEDLES AND THE GRABENS

    [Illustration: THE NEEDLES, looking southwest from Squaw Flat. (Fig.
    49)]

    [Illustration: CHESLER PARK IN THE NEEDLES, aerial view looking
    northeast. Photograph by Walter Meayers Edwards, © 1971 National
    Geographic Society. (Fig. 50)]

The northeastern edge of The Needles proper can be seen from Squaw Flat
(fig. 49), but the true character of The Needles can be appreciated
better from the air (fig. 50). You cannot get far into The Needles
without traversing part of The Grabens, so we will consider them
together. An aerial oblique view (fig. 51) shows The Needles in the
foreground and The Grabens in the middle background. As shown on the map
(fig. 1), you can hike into The Needles and The Grabens from Squaw Flat,
but let us make the trip using a four-wheel-drive vehicle and several
short hikes.

    [Illustration: THE NEEDLES AND THE GRABENS, aerial oblique view
    looking west over Chesler Park in foreground, The Grabens to the
    right, and Cataract Canyon behind. Photograph by U.S. Army Air
    Force. (Fig. 51)]

Ordinary passenger cars now can go 2-3/4 miles west of Squaw Flat to
Soda Spring, at the east base of Elephant Hill, but beyond Soda Spring
four-wheel-drive vehicles should be used. Some people conquer the hill
in dune buggies or on motorcycles, but this is considered quite
dangerous. Both sides of this short (1-1/4 miles) but formidable hill
have switchback curves too sharp to negotiate in the regular manner, so
special driving techniques must be followed. On the east side, you must
drive out on a flat rock, jockey back and forth until turned completely
around, then proceed up the hill. On the west side, you descend a
40-percent grade to a shelf, _back_ down a narrow stretch of about
30-percent grade and back sharply to the left onto a flat rock, then go
forward again. On the return trip the whole procedure is carried out in
reverse order.

West of Elephant Hill, the road reaches a Y, at which you must turn left
on a one-way road; the right-hand road is for later one-way return to
the Y. Why the left-hand fork is one way soon becomes apparent, for the
road leads into a narrow shallow graben, called Devils Pocket (fig. 51),
between rock walls, and is barely wide enough for one car. After about 2
miles the graben widens out into a beautiful spot called the Devils
Kitchen, which contains several picnic tables tucked into shady recesses
in the sandstone walls. This is the starting point for two trails
leading southward by different routes to Chesler Park, from which other
trails lead to Druid Arch or back to Squaw Flat.

From the Devils Kitchen, the road turns abruptly westward for about half
a mile to another Y in about the middle of Devils Lane, one of the
larger grabens and one of two whose entire length is traversed by roads,
as shown on the map (fig. 1). Only the left fork is a two-way road, so
let us take the left fork 2-3/4 miles southwestward to the next road
junction. About halfway down Devils Lane, a fault crossing the graben
has created a narrow steep ridge appropriately called SOB Hill, because
the road over it creates a challenge that some vehicles fail to meet on
the first attempt!

The next road intersection is now shown on the map (fig. 1) as a sharp
turn leading southwest to Ruin Park and Beef Basin. The abandoned left
fork (not shown) leads east into Chesler Park. This park, shown in
figure 50 and near the bottom of figure 51, is a beautiful natural
meadow of several hundred acres fenced by a natural wall of needles and
containing a central island of needles. Because of vehicular damage to
meadow vegetation, the National Park Service found it necessary to close
the road. To reach Chesler Park now, vehicles must go right a short
distance to the Chesler Canyon turnoff, then left about half a mile to a
parking area. From here, a 1/2-mile hike east through the narrow Joint
Trail gets us to the south side of Chesler Park, where we join the
abandoned road to reach the northeast corner of the park and the trails
into The Needles proper (fig. 1).

This change adds 1-3/4 miles (one way) to the hike to Druid Arch, making
the round trip about 11-1/2 miles. At the old trailhead, near the
northeast corner of Chesler Park, is a sign proclaiming the need for
rubber-soled shoes and water, and I strongly support these admonitions,
for much of the hike is on bare smooth sandstone and includes steep
slopes and _generally_ dry waterfalls. The hike should not be attempted
by anyone not in good physical condition, and it should not be
undertaken alone; two or more people should travel together.

As shown in figure 52, the trail to Druid Arch from Chesler Park starts
out on bare Cedar Mesa Sandstone marked by a succession of rock cairns,
two of which are visible and without which the trail would soon be lost.
The trail drops rapidly down into Elephant Canyon, which is then
followed southward 2 miles to the arch. This canyon has cut through the
Cedar Mesa into the underlying Rico Formation, and much of the canyon is
quite narrow and steep sided, as shown in figure 53. Although much of
the Rico consists of red beds laid down above sea level by ancient
streams, the trail crosses several thin beds of dark-gray hard limestone
containing fossil marine seashells and ancient sea anemones whose
original calcium carbonate parts have been locally replaced by jasper
(red iron-bearing silica). When at last the weary hiker makes the steep
climb out of the canyon and rounds the final bare-rock curve, the sudden
and striking view of Druid Arch (fig. 54) seems worth every bit of the
effort--at least it was to me and my hiking companion.

After my friend and I hiked to Druid Arch and after the length of this
route was increased to a round-trip distance of 11-1/2 miles, a new
route was constructed having a round-trip length of only 8-1/2 miles.
This new trail starts at the end of the passenger-car road at the east
edge of Elephant Hill, goes 1-1/4 miles southwest to join an older trail
in Elephant Canyon, then follows this canyon 3 miles south to the arch.

    [Illustration: TRAIL TO DRUID ARCH, near its beginning at northeast
    corner of Chesler Park, marked only by rock cairns, two of which are
    visible. (Fig. 52)]

    [Illustration: UPPER ELEPHANT CANYON, containing trail to Druid
    Arch. (Fig. 53)]

    [Illustration: DRUID ARCH, from end of arduous trail shown in
    figures 52 and 53. (Fig. 54)]

After returning to our vehicle west of Chesler Park and backtracking
over SOB Hill to the intersection in the middle of Devils Lane, let us
proceed northward on a one-way road to and beyond the Silver Stairs for
a closer look at Devils Lane and other grabens to the west and for a
look at the confluence of the Green and Colorado Rivers. But first let
us pause and reflect upon the possible origin of The Grabens.

Geologists have different opinions as to just how grabens and complex
systems of joints have formed, but all seem to agree that tensional
forces were involved. Some think that solution of salt and gypsum from
the Paradox Member of the Hermosa Formation by ground-water movement
allowed the brittle Cedar Mesa Sandstone and other overlying rocks to
sag, producing tension cracks and faults. Others believe that removal of
the salt and gypsum occurred by plastic flowage toward the Meander
anticline (see p. 108 and fig. 61), whose axis follows the Colorado
River southwest from The Loop, past the confluence, and to and beyond
Spanish Bottom. Some suppose that compaction due to the weight of the
abnormally thick pile of sedimentary rock underlying the area may have
caused the sagging, cracking, and faulting. The rock deformation may
have resulted from a combination of these and possibly other things, of
course, but whatever the cause, the resulting features are very
striking. There was room to show only two of the named grabens within
the park on the map (fig. 1), but all are shown in figure 51, and
several appear in figure 59. A diagramatic cross section of a typical
graben is shown in figure 55. The tension faults shown in figures 55 and
56 are called normal faults, in contrast to faults formed by horizontal
compression, which are called reverse faults (figs. 75, 76).

The Grabens range in width from about 7 or 8 feet at the north end of
Devils Pocket to nearly 2,000 feet at the south end of Red Lake Canyon,
but the average width is about 500 feet. The floors of The Grabens are
covered by soil and grass, but the displacement along the faults is
believed to approximate the height of the walls--nearly 300 feet. That
The Grabens are of fairly recent origin is attested by the fact that
most of the walls are vertical fault faces showing little sign of
erosion (fig. 57); that no through drainage has yet been established in
Cyclone Canyon, which is a series of basins with low divides between;
and that several pre-existing streams were interrupted or diverted by
the faulting.

    [Illustration: A SIMPLE GRABEN, formed by tension in directions
    indicated by horizontal arrows. Downdropped central block is the
    graben; stationary or uplifted blocks on sides are called horsts.
    From Hansen (1969, p. 123). See also figure 76. (Fig. 55)]

    [Illustration: CUTAWAY VIEW OF NORMAL FAULT, resulting from tension
    in and lengthening of the earth's crust. Note amount of displacement
    and repetition of strata. Compare with figure 76. From Hansen (1969,
    p. 116). (Fig. 56)]

Now let us continue our journey northward along Devils Lane. Just before
reaching the Silver Stairs we may wish to pause long enough to take in
the distant view to the northwest toward Junction Butte and Grand View
Point. (See frontispiece.) After descending the steep Silver Stairs in a
narrow cleft between rock walls, we reach another intersection: a
two-way road continuing northwest goes to our destination, and a one-way
road turning right returns to Elephant Hill via part of Elephant Canyon
(fig. 58).

About 2 miles to the northwest we cross the north end of Cyclone Canyon,
the largest graben. It contains a road 3-1/2 miles long and is well
worth seeing. About one-half mile from the south end, an old trail
follows Red Lake and Lower Red Lake Canyons to the Colorado River across
from Spanish Bottom (figs. 1, 61).

From near the north end of Cyclone Canyon (figs. 1, 59), we drive west
three-fourths mile to a parking area and hike one-half mile to an
overlook for a spectacular view of the confluence of the Green and
Colorado Rivers (figs. 59, 60) and of the northern part of Cataract
Canyon (fig. 61). These and other canyons are discussed in the next
chapter.

    [Illustration: WEST WALL OF CYCLONE CANYON GRABEN, a nearly vertical
    fault face showing little sign of erosion. (Fig. 57)]

    [Illustration: LOWER ELEPHANT CANYON, followed by jeep trail from
    near Silver Stairs to Elephant Hill. (Fig. 58)]

    [Illustration: THE CONFLUENCE FROM THE AIR, and some of The Grabens.
    See also figure 51. Vertical aerial photograph by U.S. Geological
    Survey. (Fig. 59)]

    [Illustration: THE CONFLUENCE FROM CONFLUENCE OVERLOOK, shown in
    figures 1 and 59. Green River entering from left, Colorado River
    from right. Red beds near top are Rico Formation, overlain by Cedar
    Mesa Sandstone and underlain by unnamed upper member of Hermosa
    Formation. (Fig. 60)]

    [Illustration: CATARACT CANYON, from the rim, looking south to
    Spanish Bottom at bend. Beds dip to left and right away from
    Colorado River, which here is followed by axis of Meander anticline.
    (See p. 108). Cliff below overhanging rock resembles profile of a
    man; the rock resembles his hat. Photograph by Walter Meayers
    Edwards, © 1971 National Geographic Society. (Fig. 61)]




Canyons of the Green and Colorado Rivers


We have discussed two of the three major topographic divisions of the
park--the high mesas and the benchlands--and there remains to consider
the third division--the canyons of the mighty Green and Colorado Rivers
and some of their tributaries. After we discuss a few features common to
both rivers, we will take up the details of each river.

A glance at the map (fig. 1) shows that above the confluence both rivers
are very crooked and contain many loops, or meanders, the most striking
of which are Bowknot Bend of the Green River (fig. 62), several miles
north of the park, and The Loop of the Colorado River (fig. 74). In
contrast, the main stem of the Colorado River below the confluence is
considerably straighter. Not apparent on the map are the facts that the
crooked rivers above the confluence have very gentle grades and are free
from rapids or falls, whereas a few miles south of the confluence the
main stem plunges into Cataract Canyon--the steepest and wildest reach
of the river, containing 64 rapids. These differences are partly
explicable on the basis of the geologic structure and character of the
rocks through which the rivers have cut. Above the confluence, the soft
strata dip gently northward, so in flowing generally southward the two
rivers are cutting "against the grain," which tends to impede their flow
and thus reduce their grades. Below the confluence, the hard limestones
of the Hermosa Formation lie relatively flat for several miles and then
begin to dip gently southward, thus allowing the river to cut "with the
grain" and therefore drop more rapidly.

The quiet, smooth waters above the confluence permit power boating
between the towns of Green River, Utah, and Moab during part of the
year, whereas the rapids below Spanish Bottom, 3-1/2 miles below the
confluence, restrict river travel to float trips using sturdy boats or
rafts.

Above the confluence, a so-called Friendship Cruise is run each year
during the Memorial Day weekend. Participants tow their own power boats
on trailers to the town of Green River, and after the boats are
launched, facilities are available at nominal cost for transporting cars
and boat trailers to Moab to await the arrival of the boats. Although
some high-powered speedboats are reported to have made the run down the
Green River to the confluence then up the Colorado River to Moab in a
few hours, the trip for most boats requires 2 to 7 days.

Trips by power boats, including jet boats, can be arranged from either
Green River or Moab. Some passengers from Moab return by jeep from
Lathrop Canyon via the White Rim Trail, and some from Green River return
on land via the Horsethief Trail. Many prefer the quieter float trip
down to the confluence, with return to either town by a prescheduled
power boat, and some more adventurous souls float through the rapids of
Cataract Canyon all the way to Lake Powell.

In the spring of 1972, a 93-foot 150-passenger stern-wheeler (fig. 69)
began passenger service on the Colorado River from just above Potash to
the foot of Dead Horse Point and return (Lansford, 1972).


                     Entrenched and cutoff meanders

Meanders such as those above the confluence generally are formed by
streams flowing in soft alluvium consisting of clay, silt, and sand,
such as along the Mississippi River below Cairo, Ill. But there is no
soft alluvium along the Colorado and Green Rivers, so how did these
meanders form? They probably attained their serpentine shape while
cutting in softer, younger material, which long ago was removed by
erosion, and then continued to cut their crooked channels down, until
they created the deep rock-walled canyons in which they now flow as
"entrenched" meanders.

Meandering streams tend to shorten their lengths from time to time by
cutting through narrow walls between adjacent loops, leaving abandoned
horseshoe-shaped channels or lakes. In most of the United States these
are known as oxbows or cutoff meanders, but in the desert Southwest they
are commonly called by the Spanish term "rincon." Cutoffs are common
along soft alluvial channels such as the lower Mississippi River valley
but are rare along channels whose meanders are entrenched into hard
rock. Thus, there have been many natural (and several manmade) cutoffs
along the lower Mississippi during historic times, but the most recent
ones along the Green and upper Colorado Rivers probably occurred a
million or so years ago, during the Pleistocene Epoch (figs. 65, 80).

Mark Twain served several years as an expert riverboat pilot on the
Mississippi River during which several cutoffs took place. Chapter 27 of
his "Life on the Mississippi" contains sage references to both natural
and artificial cutoffs and concludes with a few good-natured jibes at
geologists in particular and scientists in general:

  Therefore the Mississippi between Cairo and New Orleans was twelve
  hundred and fifteen miles long one hundred and seventy six years ago.
  It was eleven hundred and eighty after the cutoff of 1722. It was one
  thousand and forty after the American Bend cut-off. It has lost
  sixty-seven miles since. Consequently, its length is only nine hundred
  and seventy-three miles at present.

  Now, if I wanted to be one of those ponderous scientific people, and
  "let on" to prove what had occurred in the remote past by what had
  occurred in a given time in the recent past, or what will occur in the
  far future by what has occurred in late years, what an opportunity is
  here! Geology never had such a chance, nor such exact data to argue
  from! Nor "development of species," either! Glacial epochs are great
  things, but they are vague--vague. Please observe:

  In the space of one hundred and seventy-six years the Lower
  Mississippi has shortened itself two hundred and forty two miles. That
  is an average of a trifle over one mile and a third per year.
  Therefore, any calm person, who is not blind or idiotic, can see that
  in the Old Oölitic Silurian Period, just a million years ago next
  November, the Lower Mississippi River was upward of one million three
  hundred thousand miles long, and stuck out over the Gulf of Mexico
  like a fishing rod. And by the same token any person can see that
  seven hundred and forty-two years from now the Lower Mississippi will
  be only a mile and three-quarters long, and Cairo and New Orleans will
  have joined their streets together, and be plodding comfortably along
  under a single mayor and a mutual board of aldermen. There is
  something fascinating about science. One gets such wholesale returns
  of conjecture out of such a trifling investment of fact.


                              Green River

Much more has been written about the Green River and the main stem of
the Colorado than about the Colorado above the confluence (the former
Grand River), because all but one of the early float trips began on the
Green. The first reports concerning Powell's memorable voyages of 1869
and 1871 were his articles published in Scribners Monthly during 1874
and 1875 followed by his formal 1875 report "Exploration of the Colorado
River of the West and Its Tributaries." As pointed out by Porter (1969,
p. 21), however, Powell's narrative

  is written _as if_ everything chronicled therein occurred during the
  first trip. Events which actually occurred in 1871 and 1872 are
  reported as happening in 1869. There is no mention of the personnel of
  the 1871-72 party, nor is there an indication that there even _was_ a
  second trip. The engravings illustrating the report were made from
  photographs taken by Beaman and Hillers between 1871 and 1874, but
  this fact is not noted.

For these reasons, Porter's account contains Powell's diary of the first
(1869) trip and many of the missing photographs, plus his own beautiful
color prints. Much more complete and accurate accounts of the 1871
voyage than those of Powell, including many of the photographs taken by
Beaman and Hillers, were given by Dellenbaugh (1902, 1962), who was a
member of Powell's 1871 expedition.

Numerous river trips were undertaken in the years following Powell's
pioneering expeditions. The ill-fated Brown-Stanton voyage of 1889-90
included starts on both the Grand and the Green Rivers. (See section on
"Colorado River.") More successful were Nathan Galloway and William
Richmond, trappers who left Henrys Fork, Wyo., late in 1896 and reached
Needles, Calif., on February 10, 1897 (Kolb, 1927, p. 338). Trappers
Charles S. Russell, E. R. Monette, and Bert Loper left Green River,
Utah, in three steel boats on September 20, 1907; Russell and Monette
reached Needles in one boat in February 1908, but Loper was drowned.
Dellenbaugh's 1902 book was carried by the Kolb brothers as a guide for
their 1911 trip down the river (Kolb, 1927). In addition to making
superb still photographs, the Kolb brothers took the first moving
pictures in the canyons, and these are still being shown in the Kolb
Studio on the South Rim of the Grand Canyon. Julius F. Stone and party
traversed the canyons in 1909, and his account (1932) also contains
excellent photographs. E. C. La Rue, of the U.S. Geological Survey, and
assistants made two trips down the Green and Colorado Rivers in 1914 and
1915 and additional trips from 1921 through 1924. Their comprehensive
hydrographic findings and studies, plus excellent photographs, are given
in two reports (La Rue, 1916, 1925). The 1916 report also contains (p.
16-22) a good condensed account of earlier explorations and voyages from
1531 through 1911, taken in part from Dellenbaugh (1902).

As noted earlier, a modern river runners' guide by Mutschler (1969),
which logs the Green and Colorado Rivers from Green River, Utah, to Lake
Powell, is now available. River mileages in this log were taken from
detailed topographic maps of both rivers prepared under the direction of
Herron (1917). We will visit only a few notable features of the canyons;
the mile-by-mile details for the Green River can be obtained from
Mutschler (1969), and those for the Colorado River, from Baars and
Molenaar (1971, p. 61-99). Several other references are given below, and
additional ones are given by Rabbitt (1969, p. 20-21).

    [Illustration: BOWKNOT BEND, of Green River, looking east from west
    end of narrow intervening saddle. Upper photograph was taken by E.
    O. Beaman on September 10, 1871, during second voyage of Major John
    Wesley Powell and his party. Lower photograph was taken from same
    camera station on August 19, 1968, by Hal G. Stephens, U.S.
    Geological Survey, on expedition led by E. M. Shoemaker to recover
    camera stations of the 1871 voyage and rephotograph the scenes to
    record changes during the nearly 100 year interval. Note that almost
    no changes occurred in the bedrock, or even in the loose rocks, but
    that considerable change occurred in the vegetation along the river.
    Although salt cedar (tamarisk) had been introduced into this country
    from the Mediterranean area long before 1871, it had not yet spread
    to this area, but the bare islands shown in the earlier photograph
    are covered by salt cedar in the 1968 photograph. (Fig. 62)]

    [Illustration: Figure 62, lower image]

All travelers down the Green River embarking from Green River, Utah, or
above, were impressed with Bowknot Bend (fig. 62), so named by Powell
and his men (1875, p. 54) near the beginning of Labyrinth Canyon, which
they also named for its deeply entrenched meanders. The upper photograph
in figure 62 was taken by Beaman on September 10, 1871, looking eastward
from the west end of the narrow saddle separating the upper and lower
reaches of the river; the lower photograph was taken from the same point
on August 19, 1968, by Hal G. Stephens nearly 97 years later. Although
there are changes in the vegetation, as described in the caption, there
are virtually no visible changes in the bedrock. Nevertheless, the
distant future will likely see a breakthrough, whereby Green River will
shorten itself by about 7 miles (Herron, 1917, pl. 15C). It is
interesting to note that the vertical cliffs of Wingate Sandstone in and
west of Bowknot Bend are only a few hundred feet above the river,
whereas, because of the gentle northward dip of the beds and the gentle
southward grade of the rivers, the Wingate cliffs are more than 2,000
feet above the two rivers at Grand View Point and Junction Butte, at the
southern tip of Island in the Sky.

At the mouth of Horseshoe Canyon, about 3 miles below Bowknot Bend, we
pass a large rincon where the Green River shortened its course by about
3 miles. Some idea of the rincon's antiquity is gained from the facts
that the river is now some 350 feet lower than at cutoff time, whereas
Bowknot Bend (fig. 62) has shown no visible deepening in 97 years. This
rincon was not noted by Powell or other early voyagers, seemingly
because they did not happen to climb the banks at this point, but it is
quite noticeable on modern topographic maps and on aerial photographs.
This rincon and Jackson Hole along the Colorado River may be as old as
late Tertiary (fig. 80).

At a point reported to be 350 yards above the mouth of Hell Roaring
Canyon, which enters from the east about 3-1/2 miles below the rincon,
an early day trapper named Julien left his mark. Stone (1932, p. 69, pl.
39A) seems to have been the first river runner to find (from a
description given him by a Mr. Wheeler at Green River), record, and
photograph the inscription shown in figure 63. Mutschler (1969, p. 31)
indicated that this inscription is carved on a massive Moenkopi
sandstone bed about 40 feet above the canyon floor. A similar
inscription by Julien was found in Cataract Canyon, 31 miles below the
confluence, but it is now covered by Lake Powell (Mutschler, 1969, p.
65).

Some boaters are met by car and taken out to Moab or Green River via the
Horsethief Trail (fig. 1), just north of the park. The road along the
river here continues south for 6-1/2 miles to the mouths of Taylor and
Upheaval Canyons, where it becomes the White Rim Trail.

    [Illustration: INSCRIPTION BY JULIEN, near mouth of Hell Roaring
    Canyon, thought to have been carved by Dennis Julien, an early day
    trapper. Photograph by K. Sawyer, August 1914, member of expedition
    led by E. C. La Rue (1916). (Fig. 63)]

Coming down the Green River, we enter Canyonlands National Park where
the Grand-San Juan county line meets the Emery-Wayne county line (fig.
1), about 2-1/4 miles north of Taylor and Upheaval Canyons. The National
Park Service had three successful test wells put down in Taylor Canyon,
and water under artesian pressure was found in the White Rim Sandstone
at depths of 373 to 482 feet. When funds become available, they hope to
complete one or more of these wells and pump the water up to Island in
the Sky, where two dry holes were drilled earlier.

About 5-1/2 miles below Upheaval Canyon is an interesting ruin on a hill
in the middle of a large nearly closed loop of the river enclosing Fort
Bottom. This was noted by Dellenbaugh (1902) during Powell's 1871 trip
and was described in more detail by Mutschler (1969, p. 33-34):

  The ruin consists of two, two-story, interconnected, crudely circular
  towers, and a third separate, completely collapsed tower, built on the
  summit of the bluff with a commanding view downriver and of Fort
  Bottom. Other collapsed structures are present on the summit, and a
  slab-lined cist is present beneath the Moss Back ledge west of the
  towers. The ruin was built of dry laid masonry and most of the mud
  plaster on the inside has been washed away, leaving the structure in
  danger of imminent collapse. Please do not climb the walls!

Fort Bottom also contains a cabin believed to have been used by Butch
Cassidy and the Wild Bunch (Baker, 1971, p. 198).

At about the mouth of Millard Canyon, we leave Labyrinth Canyon and
enter Stillwater Canyon, aptly named by members of the 1869 Powell
voyage (Dellenbaugh, 1902, p. 276). The beginning of Stillwater Canyon
is marked by vertical walls of the White Rim Sandstone. From here
Powell's men observed a butte to the southwest thought to resemble a
fallen cross and named it "Butte of the Cross." Farther downstream they
realized they had been looking at two buttes, a small one in front of a
larger one, so the feature was renamed "Buttes of the Cross." An aerial
view of Buttes of the Cross is shown in figure 64.

    [Illustration: BUTTES OF THE CROSS, looking southwest from the air.
    Millard Canyon enters Green River in foreground, North Point is in
    right middle ground, Orange Cliffs are in background, and Henry
    Mountains form right skyline. White Rim Sandstone forms White Rim
    near mouth of Millard Canyon and near Anderson Bottom at left
    middle. (See fig. 65.) Buttes are Wingate Sandstone capped by
    Kayenta Formation; slopes down to prominent ledge are Chinle
    Formation, Moss Back Member forming the ledge; steep and gentle
    slopes between ledge and White Rim are Moenkopi Formation.
    Photograph by National Park Service. (Fig. 64)]

About 2 miles below the mouth of Millard Canyon, at Anderson Bottom, we
reach one of the most interesting features on the river--the most recent
rincon of a major river in the park, if not in the entire canyon
country. Although some rincons are more recent, they are along minor
tributaries such as Indian Creek (fig. 73). The cutoff at Anderson
Bottom probably took place during the Pleistocene Epoch, whereas most of
the others along the main rivers probably occurred during the Tertiary
Period (fig. 80). An aerial view of the Anderson Bottom rincon is shown
in figure 65, and a sketch of the drainage change is shown in figure 66.
This feature was noted and correctly interpreted by Powell and his men,
who applied the name Bonita Bend to the sharp new course the river took
after the cutoff.

Continuing through Stillwater Canyon, we pass Turks Head (figs. 23, 24)
and head for the confluence of the Green River with the Colorado River.
Figure 67 shows the canyon just west of the confluence. The lowest and
largest cliff above the river is the upper member of the Hermosa
Formation, overlain by the slopes and thin ledges of the Rico Formation.
The massive sandstone at the top of the canyon wall is the Cedar Mesa.
Junction Butte and Grand View Point are on the right skyline.

We have already viewed the confluence and Cataract Canyon from the land
and from the air (figs. 59-61); soon we will see them from the Colorado
River.

    [Illustration: Petroglyph]

    [Illustration: ANDERSON BOTTOM RINCON, aerial view looking
    southeast. Jointed White Rim Sandstone forms the clifflike canyon
    walls and the mesa in middle of Anderson Bottom. Green River is now
    about 60 feet lower than former channel at right. Photograph by
    National Park Service. (Fig. 65)]

    [Illustration: DRAINAGE CHANGES AT ANDERSON BOTTOM RINCON. River
    shortened itself about 2 miles by this cutoff. (Fig. 66)]

    [Illustration: STILLWATER CANYON, of Green River, viewed from a
    point on the south rim about 1 mile above (west of) confluence with
    the Colorado River. Upper photograph was taken by E. O. Beaman on
    September 16, 1871, during second Powell voyage. Lower photograph
    was taken from same camera station on August 23, 1968, by Hal G.
    Stephens, U. S. Geological Survey. (See caption for figure 62.) Note
    that there are no noticeable changes in rocks or bushes away from
    the river but that sand bars in the early photograph are covered
    with salt cedar (tamarisk) in the later photograph, as described for
    figure 62. (Fig. 67)]

    [Illustration: Figure 67, lower]


                             Colorado River

As indicated earlier, all but one of the early river voyages began on
the Green River. The Grand (Colorado) River above the confluence was
neglected for some 18 years after Powell's second voyage, until, in
1889, Frank M. Brown organized a company for construction of the
proposed Denver, Colorado Canyon, and Pacific Railway. This railroad was
to carry coal from mines in Colorado over a "water-level" line through
the canyons of the Colorado River to the Gulf of California some 1,200
miles away; from there the coal would presumably be shipped to ports as
far north as San Francisco (Dellenbaugh, 1902, p. 343-369). On March 26,
1889, Brown, president, F. C. Kendrick, chief engineer, and T. P.
Rigney, assistant engineer, drove the first stake for a survey of the
new line at Grand Junction, Colo., then Brown left for the East to
obtain financing, and the other two plus some hired hands took off down
the Grand River. After reaching the confluence they towed the boat up
the Green River, thus becoming the first to make this trip upstream.
They nearly ran out of food, but thanks to the hospitality of some
cattlemen, they replenished their stock and after about 9 days reached
the railroad at Green River, Utah. Brown, who had returned from the
East, his newly appointed chief engineer, Robert Brewster Stanton, and
14 others in six ill-designed boats of cedar, rather than oak, left
Green River on May 25, 1889. Against the advice of Major Powell and A.
H. Thompson, Powell's topographer on the 1871 trip, they carried no life
preservers. After many mishaps, Brown and two others were drowned near
the head of Marble Canyon, and the ill-fated expedition was temporarily
halted. However, the indefatigable Stanton contracted for new boats
built of oak and, with a reorganized party of 12, left the mouth of the
Fremont (Dirty Devil) River on November 25. After many further mishaps,
the party finally reached the Gulf of California on April 26, 1890.
Needless to say the proposed railway was not built.

Although the Colorado River enters Canyonlands National Park about 33
river miles below Moab, most boaters or floaters begin their voyage
either at Moab or near Potash, and most travelers of the White Rim Trail
begin at Moab, so we will start our trip at Moab. No logs or river
runners' guides are available as yet for the reach from Moab to Potash,
but below Potash some details of the geology have been described by
Baars in Baars and Molenaar (1971, p. 59-87).

As noted at the beginning of this chapter, above the confluence both the
Green and Colorado Rivers are very crooked, have very low grades, and
are free from rapids. As with the Green, the soft rocks along the
Colorado have a generally low northward dip that partly explains the
river's gentle grade and its southward flow through increasingly lower
and older strata. Unlike the Green, however, the gentle dips of the
strata in the canyons of the Colorado are interrupted by several gentle
anticlinal (fig. 14) and synclinal (fig. 26) folds and by at least one
fault. The most important of these geologic structures and other
features will be noted as we journey down the river.

The first 14 miles from Moab Valley to Potash can be made either by
river or by paved Utah Highway 279. This highway leaves U.S. Highway 163
near the uranium ore-reduction plant several miles northwest of Moab,
leaves Moab Valley through The Portal (fig. 68), and follows the west
bank of the river. A paved secondary road from Moab follows the east
bank of the river through The Portal and through Kings Bottom, where it
crosses the Kings Bottom syncline, to the mouth of Kane Springs Canyon,
then becomes a gravel road that ascends this canyon southward to and
beyond Hurrah Pass (fig. 30). High above this road north of Kings Bottom
are petroglyphs and a few cliff dwellings in the vertical cliffs of
Wingate Sandstone. A ranch "house" at Kings Bottom has been excavated
entirely into the Wingate cliff. Convenient turnouts have been provided
at several places along Highway 279 for viewing petroglyphs or other
points of interest. Small viewing tubes welded to vertical steel posts
having signs help visitors locate and see the features described.

    [Illustration: THE PORTAL, in south wall of Moab Valley, through
    which the Colorado River, Utah Highway 279 (on right), and a paved
    secondary road (on left) leave the valley to enter the canyons in
    and above Canyonlands National Park. Rounded remnants on top are
    Navajo Sandstone; cliffs are Kayenta Formation and Wingate
    Sandstone; red slopes are Chinle and Moenkopi Formations, and
    perhaps a little of the Cutler Formation at the base. Light-colored
    patches at base of slope behind trees on left are contorted
    intrusions of Paradox Member of Hermosa Formation. (Fig. 68).]

The Kings Bottom syncline (fig. 30) southwest of Moab Valley brings the
Navajo Sandstone down to and slightly below water level, whereas at The
Portal (fig. 68) the Navajo caps the southwest wall of Moab Valley.
Several anticlines at or near the river from Potash to and beyond the
confluence (fig. 1) bring up strata as old as the Rico or the unnamed
upper member of the Hermosa. Between these extremes, much of the river's
course lies in strata of the Cutler Formation.

About 7 miles below The Portal, Highway 279 is joined on the right by a
branch line of the Denver and Rio Grand Western Railroad completed in
1962 to haul potash 36 miles from the mine at Potash north to the main
line at Crescent Junction. The railroad emerges from a tunnel at the
head of Bootlegger Canyon. Two natural arches near the mouth of the
tunnel--Pinto and Little Rainbow Bridge--can be reached by trail. About
3 miles farther down the Colorado is a temporary dock from which jet
boats and the _Canyon King_, a 93-foot 150-passenger stern-wheeler, take
off for points downriver during the spring and early summer, when water
depth permits. The _Canyon King_ (fig. 69), a small replica of a
Mississippi River stern-wheeler, carries passengers about 30 miles
downriver to the foot of Dead Horse Point and returns (Lansford, 1972).

About 12 miles below The Portal we reach Potash--the potash "mine" (fig.
70) of Texas Gulf, Inc. (See fig. 31 and its associated text for
description of operation.) Travelers down the jeep trail below Potash
pass the evaporation ponds (fig. 71) used to separate the potash from
common salt.

    [Illustration: THE _CANYON KING_, a 93-foot 150-passenger
    stern-wheeler which hauls passengers some 30 miles below Potash and
    returns. Trips run during the spring and early summer, when water
    depth permits. Photograph by Henry Lansford, Boulder, Colo. (Fig.
    69)]

    [Illustration: POTASH MINE OF TEXAS GULF, INC. at Potash, as viewed
    from a boat. High cliffs on right are Wingate Sandstone capped by
    Kayenta Formation and underlain by slopes of Chinle and Moenkopi
    Formations. (Fig. 70)]

    [Illustration: EVAPORATION PONDS, used to separate potash from
    common salt, viewed from jeep trail. Black borders are parts of
    plastic membranes covering bottoms of ponds. Crest of Cane Creek
    anticline and La Sal Mountains in right background. (Fig. 71)]

Across the river east from Potash is Jackson Hole, a large rincon. Since
abandonment, which shortened the river by about 3-1/2 miles, the river
has cut its channel nearly 200 feet deeper. It is comparable in size to
the large rincon along Green River below Bowknot Bend (p. 90) but
probably is somewhat younger. Both rincons may be as old as late
Tertiary (fig. 80). Just below Potash we cross the axis of the huge Cane
Creek anticline (fig. 31) and also leave Grand County to enter San Juan
County. A mile east of this point, high on the canyon wall, is the
School Section 13 uranium mine, which has yielded considerable ore and
is expected to resume production sometime during 1973. It can be seen
from the river or the trail, and some of the tailings are visible on the
left flank of the anticline in figure 13.

Voyagers who cross the axis of the Cane Creek anticline may observe on
the right-hand (west) bank a protruding oil-well casing, some drill
bits, and several shacks--all that remain of the Frank Shafer No. 1 oil
test started during the winter of 1924-25 and completed by the Midwest
Exploration Co. (Baker, 1933, p. 81). As described by Maxine Newell
(U.S. Natl. Park Service, written commun., 1970),

  The well blew in in December 1925, caught fire, and spewed burning oil
  300 feet into the air. * * * The local Times-Independent newspaper
  called it "Mother Nature's Christmas Gift to Grand County." The gusher
  burned down the rig, a barge of equipment, and it took three months to
  get it under control. Then it didn't produce.

Various 1925 and 1926 issues of the Moab Times-Independent reported that
despite many efforts to plug the well, it continued to flow from 1,000
to several thousand barrels of oil per day for 6 months or more, all of
which floated down the river. The last blowout occurred in 1937, after
which the well was plugged with an additional 180 tons of cement.

Mrs. Newell added,

  The stories told of the early-day exploration are endless and
  delightful. Equipment and supplies were barged down the Colorado River
  by the old Moab Garage Company; in winter months materials were
  carried by team and sled over the river ice. They would take a couple
  of rig timbers and pile a lot of lumber on them (they could take
  10,000 feet), then we'd give them a start with a crowbar and the mules
  would trot all the way downhill to the well. When they'd get there
  they had a little trouble stopping sometimes; they would turn into the
  bank, unload, then put the double trees on one mule, ride the other,
  and head back for a new load of rig lumber.

The evaporation ponds shown in figures 31 and 71 are in Shafer Basin, a
synclinal basin separating the Cane Creek anticline and Shafer dome. We
cross the axis of Shafer Basin about 2 miles below the county line.

Further downstream is Shafer dome, a closed anticlinal bulge just beyond
the W-shaped bend in the river as shown in figure 29. Parts of the dome
also show up in the lower right of figure 13 and the lower left of
figure 15. From almost anywhere in the Goose Neck, the sharp bend of the
river shown in figure 15, we get an excellent view of Dead Horse Point
some 2,000 feet above.

Robert R. Norman (oral commun. Feb. 27, 1973) described to me a small
petrified forest--which he said resembles a log jam--in the eastern part
of the Shafer dome, at mileage 39 (Baars and Molenaar, 1971, p. 65),
just north of this point about half way between the river and the jeep
trail below Dead Horse Point. He estimated that there probably are 20 to
30 logs, some of which are as large as 18 inches in diameter and more
than 20 feet long, and also described a stump about 3 feet in diameter.
They occur in red beds at about the middle of the Rico Formation, hence
could be either Pennsylvanian or Permian in age (figs. 9, 80). The
original wood has been replaced by silica (SiO_{2}) and stained a dark
reddish brown, as shown in figure 72.

Mr. Norman and his brother also discovered many teeth of a primitive
sharklike fish in the Rico Formation at the same general locality as the
petrified wood and also in the Rico on the Cane Creek anticline. I
submitted two of the teeth to Dr. David H. Dunkle, curator of the
Cleveland Museum of Natural History, who reported them to be "one tooth
of the cochliodont 'shark' _Deltodus_, and one tooth of the petalodont
'shark' _Petalodus_" (written commun., May 22, 1973).

About 4 miles below the Goose Neck, we enter Canyonlands National Park
and remain in the park almost to the north end of Lake Powell.

About 6-1/2 miles into the park, at the north end of a bend much like
the Goose Neck, is the mouth of Lathrop Canyon, where many boaters stop
for lunch and where a side road connects with the White Rim Trail (fig.
1).

Six and one half miles below Lathrop Canyon is the mouth of Rustler
Canyon, which is joined near its mouth by Indian Creek--the creek
followed by the highway leading to The Needles from U.S. 163. Within an
airline distance of only 3 miles, the lower reach of Indian Creek, an
intermittent stream, flows past four small rincons, three of which (fig.
73) are within an airline distance of only 0.8 mile. The stream has cut
its new channel into the red sandstones and shales of the Cutler
Formation only 15 to 20 feet deeper than the abandoned ones in the two
rincons at the left in figure 73 and only about 25 feet deeper than the
one on the right. These figures suggest, at least to me, that these
cutoffs probably occurred sometime during the Holocene Epoch, or age of
man--that is, probably within the last 10,000 years (fig. 80). A
detailed study of these rincons might change this estimate, particularly
if, say, buried driftwood or other carbonaceous material could be found
for an age determination by the radiocarbon method.

    [Illustration: PETRIFIED LOG, near middle of Rico Formation, about 1
    mile southeast of Dead Horse Point. Log is estimated to be about 18
    inches in diameter. Photograph by Robert R. Norman. (Fig. 72)]

    [Illustration: RELATIVELY RECENT RINCONS ALONG INDIAN CREEK, about
    3-1/2 miles above mouth and about 2 miles east of Canyonlands
    National Park. Above, stereoscopic pair of aerial photographs by
    U.S. Geological Survey; below, sketch showing drainage changes. The
    stereoscopic pair can be viewed without optical aids by those
    accustomed to this procedure, or by use of a simple double-lens
    stereoscope. (Fig. 73)]

    [Illustration: Figure 73, diagram]

    [Illustration: THE LOOP, of Colorado River, about 5 miles northeast
    of the confluence. Lower canyon walls are unnamed upper member of
    Hermosa Formation overlain by slopes of the Rico Formation. Jointed
    sandy ledges at top become sandier to south, where they comprise the
    Cedar Mesa Sandstone. Aerial photograph by U.S. Geological Survey.
    (Fig. 74)]

About 5 miles below the mouth of Rustler Canyon and Indian Creek, and
also about 5 miles above the confluence, is The Loop--an even sharper
and more symmetrical figure eight than Bowknot Bend of the Green River
(fig. 62). An aerial view of The Loop (fig. 74) shows that the channels
on the south loop are only about 500 feet apart and that those on the
north loop are only about 1,700 feet apart. At the narrowest places,
both saddles are considerably eroded--the southern one is only about 150
feet above the river, but the northern one is still about 350 feet
above. Erosion of both saddles has been hastened by the facts that the
axis of the Meander anticline (see p. 108) passes through each saddle
and that an interesting reverse fault (fig. 75) passes through the lower
and thinner southern saddle. The differences between reverse and normal
faults are shown by comparing figures 56 and 76. It seems inevitable
that some day the small saddle will be cut through by the Colorado
River, and a new rincon will result. Eventually, the other loop also
probably will be abandoned. As one of my colleagues remarked, how
wonderful it would seem, to be present at the proper moment to witness
such an event, particularly if one had a time-lapse movie camera to
record it for posterity!

    [Illustration: REVERSE FAULT in southern saddle of The Loop, looking
    northwest from boat in river. Apparent angle of dip is 12° below
    horizontal. Rocks at left, above fault plane, have been shoved about
    10 feet past and over those on right. Curving of dark bed near
    middle of fault plane is called "drag." (See fig. 76.) Rocks are
    unnamed upper member of Hermosa Formation. (Fig. 75)]

    [Illustration: CUTAWAY VIEW OF REVERSE FAULT, resulting from
    horizontal compression, which caused a shortening of earth's crust.
    Note "drag" of beds on each side of fault plane. Low-angle reverse
    faults, also called thrust faults, may have displacements ranging
    from a few feet to many miles. From Hansen (1969, p. 116). (Fig.
    76)]

About a mile and a half below the south saddle of The Loop we meet the
mouth of Salt Creek, which drains a large part of the Needles district.
Figure 77 was taken in Salt Creek canyon about 2 airline miles above the
mouth looking southeast toward Six-Shooter Peaks and Shay Mountain,
northernmost of the Abajo Mountains, on the horizon.

A mile and a half above the confluence is The Slide, a jumbled mass of
angular blocks of rock that fell from the northwest canyon wall and
originally probably extended all the way to the southeast bank of the
river. As shown in figure 78, it still extends nearly across the river,
leaving only a narrow deep chute along the southeast bank. Just after
the photograph was taken, we hit rough fast water in the chute, with
waves about 2 feet high. At higher stages of the river, progressively
more of The Slide is covered by water, and there is less tendency for
waves to form. The date of this landslide is not known, but it is shown
on a map by Herron (1917, pl. 22A) made prior to 1917 and may well have
occurred during prehistoric times.

Soon we reach the confluence of the Green and Colorado Rivers (figs. 59,
60). This important junction of two mighty rivers was noted by all
previous voyagers, but their impressions of it differed considerably.
Powell (1875, p. 56) remarked:

  These streams unite in solemn depths, more than one thousand two
  hundred feet below the general surface of the country. The walls of
  the lower end of Stillwater Cañon are very beautifully curved [see
  fig. 67], as the river sweeps in its meandering course. The lower end
  of the cañon through which the Grand comes down, is also regular, but
  much more direct, and we look up this stream, and out into the country
  beyond, and obtain glimpses of snow clad peaks, the summits of a group
  of mountains known as the Sierra La Sal [La Sal Mountains]. Down the
  Colorado, the cañon walls are much broken.

Dellenbaugh (1902, p. 277) gave a fuller description but concluded: "In
every way the Junction is a desolate place"--an appraisal with which I
disagree. The most colorful account I have read is that of Captain
Francis Marion Bishop, a member of Powell's 1871 expedition, who
recorded in his journal for September 15, 1871 (1947, p. 202):

  Well, we are at last, after many days of toil and labor, here at the
  confluence of the two great arteries of this great mountain desert. No
  more shall our frail boats dash through thy turbid waters, Old Green,
  and no more shall we press on to see the dark flood from the peaks and
  parks of Colorado. Grand and Green here sink to thy rest, and from thy
  grave the _Colorado de Grande_ shall flow on forever, and on thy bosom
  henceforth will we battle with rock and wave. One can hardly tell
  which is the largest of the two rivers. Neither seems to flow into the
  other, but there seems to be a blending of both, and from their union
  rolls the Colorado River.

    [Illustration: SALT CREEK CANYON, looking southeast from point on
    rim 2 miles above mouth. Lower ledges are limestones in unnamed
    upper member of Hermosa Formation; slope and upper cliff are Rico
    Formation capped by remnants of Cedar Mesa Sandstone. Horizon shows
    Six-Shooter Peaks in center and Shay Mountain, northernmost of Abajo
    Mountains, at right. Photograph by E. N. Hinrichs. (Fig. 77)]

    [Illustration: THE SLIDE, which partly blocks the Colorado River
    about 1-1/2 miles above the confluence. View downstream. (Fig. 78).]

Cataract Canyon heads at the confluence, but the rapids do not appear
until we leave Spanish Bottom some 3-1/2 miles below. Between The Loop
and Spanish Bottom, the Colorado River follows closely the axis of an
anticline. Along this reach the rock strata dip downward away from the
river, as shown in figure 61. This fold was noted by Powell and some of
his men, and Bishop (1947, p. 203) reported in his journal for September
16, 1871:

  He [Steward] is at a loss how to account for the folded appearance of
  the strata here. But doubtless will find some explanation. Says the
  dip recedes from the river cañon, and thinks it is a fissure. Maj.
  [Powell] thinks it is owing to an upheaval, and that the beds next to
  the river have broken up from the mass, etc., etc.

Forty-four years later Harrison (1927) named this structure the Meander
anticline and concluded that the weight of the rocks on each side of the
river had squeezed underlying beds of salt in the Paradox Member of the
Hermosa Formation and caused them to move upward along the river, where
the confining strata had been removed by erosion. Harrison's theory was
accepted by Baker (1933) and most later workers in the area. Thus we
have what may be termed an erosional anticline, whose axis, or crest,
follows the river. Erosional anticlines also occur elsewhere, as along
the Eagle and Roaring Fork valleys of central Colorado. Mutschler and
Hite (1969) suggested that this zone of weakness in Canyonlands overlies
and follows a break in the hard Precambrian (fig. 80) rocks that
underlie the area at great depth. At any rate, Powell was on the right
track even though he was totally unaware of the underlying salt or the
deep-seated fault.

Smooth water continues from the confluence to Spanish Bottom, where the
Old Spanish Trail comes down to the river from the west and continues up
Lower Red Lake Canyon to the east. As mentioned earlier, this is about
the south end of the Meander anticline, and an intruded chunk of the
Paradox Member, mostly gypsum, occupies part of the mouth of Lower Red
Lake Canyon, as shown in figure 79.

The remaining 10 miles or so of Cataract Canyon within Canyonlands
National Park contains many rapids and should be traversed only under
the leadership of experienced river guides. If and when Lake Powell
reaches its maximum level, it will extend to within about a mile of the
park, but at present (1973) it heads near the mouth of Gypsum Canyon,
about 5 miles below the park.

    [Illustration: GYPSUM PLUG of Paradox Member, intruded along south
    end of Meander anticline at mouth of Lower Red Lake Canyon. Common
    salt has been removed by solution, leaving residue of gypsum and
    some shale. Photograph by Donald L. Baars. (Fig. 79)]

    [Illustration: Petroglyph]

    [Illustration: GEOLOGIC TIME SPIRAL, showing the sequence, names,
    and ages of the geologic eras, periods, and epochs, and the
    evolution of plant and animal life on land and in the sea. The
    primitive animals that evolved in the sea during the vast
    Precambrian Era left few traces in the rocks because they had not
    developed hard parts such as shells, but hard shells or skeletal
    parts became abundant during and after the Paleozoic Era. (Fig. 80)]




                          The Age of the Earth

The Earth is very old--four and a half billion years or more according
to recent estimates. Most of the evidence for an ancient Earth is
contained in the rocks that form the Earth's crust. The rock layers
themselves--like pages in a long and complicated History--record the
surface-shaping events of the past, and buried within them are traces of
life--the plants and animals that evolved from organic structures that
existed perhaps three billion years ago.

Also contained in rocks once molten are radioactive elements whose
isotopes provide earth scientists with an atomic clock. Within these
rocks, "parent" isotopes decay at a predictable rate to form "daughter"
isotopes. By determining the relative amounts of parent and daughter
isotopes, the age of these rocks can be calculated.

Thus the results of studies of rock layers (stratigraphy), and of the
progressive development of life (paleontology), coupled with the ages of
certain rocks as measured by atomic clocks (geochronology), attest to a
very old Earth!




                      Summary of Geologic History


Having finished our geologic ramble through Canyonlands National Park,
let us see how this pile of eroded rocks fit into the bigger scheme of
things--the geologic age and events of the earth as a whole, as depicted
in figure 80. As shown in figure 9, the rock strata still preserved in
the park range in age from Pennsylvanian to Jurassic, or from about 300
to 175 million years ago, a span of about 125 million years. This seems
an incredibly long time, until you note that the earth is some 4.5
billion years old and that our rock pile is but one twenty-fifth, or 4
percent, of the age of the earth as a whole. Thus, in figure 80 the
rocks exposed in the park occupy only about the left-hand third of the
top whorl of the spiral.

But this is not the whole story. As indicated earlier, about 10,000 feet
of younger Mesozoic and Tertiary rocks that once covered the area have
been carried away by erosion, and if we include these, the span is
increased to about 250 million years, or nearly a full whorl of the
spiral.

Deep tests for oil and gas tell us that much older rocks underlie the
area, and we have seen that some of these rocks played a part in shaping
the park we see today--note the breaks in the deep-seated Precambrian
rocks and the salt in the Paradox Member. In addition to the Precambrian
igneous and metamorphic rocks, there are about 2,000 feet of Paleozoic
sedimentary rocks older than the Pennsylvanian Paradox Member. Most of
these sedimentary rocks were laid down in ancient seas during Cambrian,
Ordovician, Devonian, Mississippian, and Pennsylvanian times (fig. 80).
There are some gaps in the rock record caused by temporary emergence of
the land above sea level and erosion of the land surface before the land
again subsided below sea level so that deposition could resume. Silurian
rocks are absent altogether, presumably because here the Silurian Period
was dominated by erosion rather than deposition.

While Pennsylvanian and Permian sediments were being deposited in and
southwest of the park, a large area to the northeast--called by
geologists the Uncompahgre highland, because it occupied the same
general area as the present Uncompahgre Plateau--rose slowly above sea
level. Whatever Paleozoic rocks there were on this rising land, plus
part of the underlying Precambrian rocks, were eroded and carried by
streams into deep basins to the northeast and southwest. Thus, while
mostly marine or nearshore deposits were being laid down in and near the
park, thousands of feet of red beds were being laid down by streams in
an area between the park and the Uncompahgre Plateau. During part of
Middle Pennsylvanian time a large area including the park and known as
the Paradox Basin was alternately connected to or cut off from the sea,
so the water evaporated during cutoff periods and was replenished during
periods when connection with the sea resumed. In this huge evaporation
basin were deposited the layers of salt and gypsum plus some potash
salts and shale that now make up the Paradox Member.

The old Uncompahgre highland continued to shed debris into the bordering
basins until Triassic time, when it began to acquire a veneer of red
sandstone and siltstone of the Chinle Formation (Lohman, 1965). The area
remained above sea level during the Triassic Period and most if not all
the Jurassic Period, although the Jurassic Carmel Formation was laid
down in a sea that lay just to the west.

Late in the Cretaceous Period a large part of central and southeastern
United States, including the eastern half of Utah, sank beneath the sea,
as shown in figure 81, and received thousands of feet of mud, silt, and
some sand that later compacted into the Mancos Shale. This formation and
all the younger and some older strata have long since been eroded from
the park area but are present in adjacent areas, such as the lower
slopes of the Book Cliffs north of Green River, Crescent Junction, and
Cisco (fig. 7).

The land rose above the sea at about the close of the Cretaceous and has
remained above ever since, although inland basins and lakes received
sediment during parts of the Tertiary Period. Compressive forces in the
earth's crust produced some gentle folding of the strata at the close of
the Cretaceous, but more pronounced folding and some faulting occurred
during the Eocene Epoch, when most of the Rocky Mountains took form.
During the Miocene Epoch molten igneous rock welled up into the strata
to form the cores of the nearby La Sal, Abajo, and Henry Mountains (fig.
7). Additional uplift and some folding occurred in the Pliocene and
Pleistocene Epochs.

    [Illustration: LATE CRETACEOUS SEA, which covered parts of central
    and southeastern United States. (Fig. 81)]

Much of the course of the Colorado River was established in the Miocene
Epoch, with some additional adjustments in the late Pliocene and early
Pleistocene Epochs (Hunt, 1969, p. 67). Erosion during much of the
Tertiary Period and all of the Quaternary Period, combined with some
sagging and breaking of the crust brought on by solution and lateral
squeezing of salt beds beneath The Needles, The Grabens, and the Meander
anticline, produced the landscape as we now see it.

The Precambrian rocks beneath the area are about 1.5 billion years old,
so an enormous span of time is represented by the rocks and events in
and beneath Canyonlands National Park.

If we consider the geologic formations that make up the Colorado
Plateau--including national parks (N.P.), national monuments (N.M.)
(excluding small historical or archeological ones), Monument Valley, San
Rafael Swell, and Glen Canyon National Recreation Area--certain
formations or groups of formations play starring roles in some parks or
monuments, some play supporting roles, and in a few places the entire
cast of rocks gets about equal billing. Let us compare them and see how
and where they fit into the geologic time spiral (fig. 80).

Dinosaur N. M., with exposed rocks ranging in age from Precambrian to
Cretaceous, represents the greatest time span (nearly 2 billion years)
but has one unit--the Jurassic Morrison Formation--in the starring role,
for this unit contains the many dinosaur fossils that give the monument
its name and fame; several older units have supporting roles. Grand
Canyon N. P. and N. M. are next, with rocks from Precambrian through
Permian (excluding the Quaternary lava flows in the N. M.), but here
there is truly a team effort, for the entire cast gets about equal
billing. Canyonlands N. P. stands third in size of cast, with rocks
ranging from Pennsylvanian to Jurassic, but we would have to give top
billing to the Permian Cedar Mesa Sandstone Member of the Cutler
Formation, from which The Needles, The Grabens, and most of the arches
were sculptured; the Triassic Wingate Sandstone and Kayenta Formation
get second billing for their roles in forming and preserving Island in
the Sky and other high mesas.

Now let us consider those with only one or few players in the cast,
beginning at the bottom of the time spiral. Black Canyon of the Gunnison
N. M., cut entirely in rocks of early Precambrian age (except for only a
veneer of much younger rocks), obviously has but one star in its cast.
Colorado N. M. contains rocks ranging from Precambrian to
Cretaceous--equal to Dinosaur in this respect--but it is unique in that
all the rocks of the long Paleozoic Era and some others are missing from
the cast; of those that remain, the Triassic Wingate and Kayenta are the
stars, with strong support from the Jurassic Entrada Sandstone.

All the bridges in Natural Bridges N. M. were carved from the Permian
Cedar Mesa Sandstone, also the star in Canyonlands N. P. In Canyon de
Chelly (pronounced "dee shay") N. M. and Monument Valley (neither N. P.
nor N. M., as it is owned and administered by the Navajo Tribe), the de
Chelly Sandstone Member of the Cutler Formation--a Permian member
younger than the Cedar Mesa--plays the starring role.

Wupatki N. M., near Flagstaff, Ariz., stars the Triassic Moenkopi
Formation. Petrified Forest N. P. (which now includes part of the
Painted Desert) also has but one star--the Triassic Chinle Formation,
with its many petrified logs and stumps of ancient trees. The
Triassic-Jurassic Glen Canyon Group (fig. 9), which includes the
Triassic Wingate Sandstone and Kayenta Formation and the
Triassic-Jurassic Navajo Sandstone, receives top billing in recently
enlarged Capitol Reef N. P., but the Triassic Moenkopi and Chinle
Formations enjoy supporting roles.

The Triassic-Jurassic Navajo Sandstone, erosional remnants of which are
found on the high mesas of Canyonlands N. P., is the undisputed star of
Zion N. P., Rainbow Bridge N. M., and Glen Canyon National Recreation
Area, despite the fact that the latter is the type locality of the
entire Glen Canyon Group (fig. 9). The Navajo also forms the impressive
reef at the eastern edge of the beautiful San Rafael Swell (a dome, or
closed anticline, fig. 7), now crossed by Highway I-70 between Green
River and Fremont Junction, Utah.

As we journey upward in the time spiral (fig. 80), we come to the
Jurassic Entrada Sandstone, which stars in Arches N. P., with help from
the underlying Navajo Sandstone and a supporting cast of both older and
younger rocks. The Entrada also forms the grotesque erosional forms
called "hoodoos and goblins" in Goblin Valley State Park, north of
Hanksville, Utah.

Moving ever upward in the spiral, we come to the Cretaceous--the age of
the starring Mesaverde Group, whose caves in Mesa Verde N. P. now house
beautifully preserved ruins once occupied by the Anasazi, the same
ancient people who once dwelt in Canyonlands N. P.

This brings us up to the Tertiary Period, during the early part of which
the pink limestones and shales of the Paleocene and Eocene Wasatch
Formation were laid down in inland basins. Beautifully sculptured
cliffs, pinnacles, and caves of the Wasatch star in Bryce Canyon N. P.
and nearby Cedar Breaks N. M. This concludes our climb up the time
spiral, except for Quaternary volcanoes and some older volcanic features
at Sunset Crater N. M., near Flagstaff, Ariz.

Thus, one way or another, many geologic units that formed during the
last couple of billion years have performed on the stage of the Colorado
Plateau and, hamlike, still lurk in the wings eagerly awaiting your
applause to recall them to the footlights. Don't let them down--visit
and enjoy the national parks and monuments of the Plateau, for they
probably are the greatest collection of scenic wonderlands in the world.

    [Illustration: Dinosaur]




Additional Reading


Many reports covering various aspects of the area have been cited in the
text by author and year, and these plus a few additional ones are listed
below under "Selected References." A few of general or special interest
should be mentioned, however.

Between 1926 and 1931 virtually the entire area now included in the park
was mapped geologically in three classic reports--two by Baker (1933,
1946) and one by McKnight (1940). These men and their field assistants
mapped the area by use of the plane table and telescopic alidade without
benefit of modern topographic maps or aerial photographs, except for
topographic maps of narrow stretches along the Green and Colorado Rivers
made under the direction of Herron (1917). Only small sections could be
reached by automobile, so nearly all the area was traversed using horses
or by hiking.

During the uranium boom of the early and middle 1950's, the U.S.
Geological Survey remapped the topography of most of the area at a scale
of 1:24,000 and also remapped the geology of much of the area at this
same scale. The southern part of the Needles district was mapped by
Lewis and Campbell (1965). The geologic mapping west of the Green and
Colorado Rivers was done by F. A. McKeown, P. P. Orkild, C. C. Hawley,
and others; that east of the Colorado River and a little between the two
rivers was done by E. N. Hinrichs and others. Only four of the geologic
maps have been published (Hinrichs and others, 1967, 1968, 1971a, b),
but all this work and the older reports were used by Williams (1964) in
compiling the 1:250,000-scale geologic map of the Moab quadrangle, by
Williams and Hackman (1971) in compiling a similar map of the Salina
quadrangle, and by Haynes, Vogel, and Wyant (1972) in compiling a
similar map of the Cortez quadrangle. These three maps show the geology
of the entire park.

The 1970 issue of the Naturalist in which the cited papers by Jennings,
Newell, and Stokes appear also contains other papers on Canyonlands
National Park, including one on the plants.

Several early reports on the Green and Colorado Rivers and their
potential utilization contain a wealth of information and many fine
photographs--two reports on the Colorado River by La Rue (1916, 1925),
one on the Green River by Wooley (1930), and one on the upper Colorado
River (above the confluence) by Follansbee (1929).

For those who wish to learn more about the science of geology, I suggest
the textbook by Gilluly, Waters, and Woodford (1968).




                            Acknowledgments


My deep appreciation goes to Bates Wilson, former superintendent of
Canyonlands National Park, and to Joe Carithers, former assistant
superintendent, for their splendid cooperation in supplying data and
information and for making available four-wheel-drive vehicles. I also
wish to thank Chuck Budge, former chief ranger; Dave May, assistant
chief ranger; Joe Miller, former maintenance engineer; Bob Kerr, new
superintendent; Maxine Newell, park historian and member of the staff at
Arches National Park; Jerry Banta, park ranger at Arches; and Dave
Minor, district ranger for the Needles district, for their many favors.

I am grateful to several colleagues and friends for the loan of
photographs, for geologic help and data, and for reviewing this report.
I am also deeply grateful to my wife Ruth for accompanying me on all the
field work and for her help and encouragement.




                          Selected references


  Baars, D. L., and Molenaar, C. M., 1971, Geology of Canyonlands and
          Cataract Canyon: [Durango, Colo.] Four Corners Geol. Soc., 6th
          Field Conf., Cataract Canyon River exped., 99 p.
  Baker, A. A., 1933, Geology and oil possibilities of the Moab
          district, Grand and San Juan Counties, Utah: U.S. Geol. Survey
          Bull. 841, 95 p.
  ____ 1946, Geology of the Green River Desert-Cataract Canyon region,
          Emery, Wayne, and Garfield Counties, Utah: U.S. Geol. Survey
          Bull. 951, 122 p.
  Baker, Pearl, 1971, The Wild Bunch at Robbers Roost: New York,
          Toronto, London, Abelard-Schuman, 224 p.
  Bishop, Captain Francis Marion, 1947, Bishop's Journal edited by
          Charles Kelley, _in_ Biographical sketches and original
          documents of the second Powell expedition of 1871-72: Utah
          State Hist. Soc., Utah Hist. Quart., v. 15, p. 159-238.
  Crampton, C. G., 1964, Standing up country, the canyon lands of Utah
          and Arizona: New York, Alfred A. Knopf (Utah Univ. Press, in
          association with Amon Carter Mus. Western Art), 191 p.
  Dellenbaugh, F. S., 1902, The romance of the Colorado River: New York,
          G. P. Putnam's Sons, 399 p. [reprinted 1962 by Rio Grande
          Press, Chicago, III.]
  ____ 1962, A canyon voyage: The narrative of the second Powell
          Expedition down the Green-Colorado River from Wyoming, and the
          explorations on land, in the years 1871 and 1872: New Haven
          and London, Yale Univ. Press, Foreword by William H.
          Goetzmann, 277 p.
  Everhart, W. C., 1972, The National Park Service, Praeger Library of
          U.S. Government Departments and Agencies No. 13: New York,
          London, Praeger Publishers, Inc., 276 p.
  Findley, Rowe, 1971. Canyonlands--realm of rock and the far horizon:
          Nat Geog. Mag., July, p. 71-91.
  Follansbee, Robert, 1929, Upper Colorado River and its utilization:
          U.S. Geol. Survey Water-Supply Paper 617, 394 p.
  Gilluly, James, Waters, A. C., and Woodford, A. O., 1968, Principles
          of geology [3d ed.]: San Francisco and London, W. H. Freeman
          and Co., 685 p.
  Hansen, W. R., 1969, The geologic story of the Uinta Mountains [with
          graphics by John R. Stacy]: U.S. Geol. Survey Bull. 1291,
          144p.
  Harrison, T. S., 1927, Colorado-Utah salt domes: Am. Assoc. Petroleum
          Geologists Bull., v. 11, no. 2, p. 111-133.
  Haynes, D. D., Vogel, J. D., and Wyant, D. G., 1972, Geology,
          structure, and uranium deposits of the Cortez quadrangle,
          Colorado and Utah: U.S. Geol. Survey Misc. Geol. Inv. Map
          I-629.
  Herron, W. H., 1917, Profile surveys in the Colorado River basin in
          Wyoming, Utah, Colorado, and New Mexico: U.S. Geol. Survey
          Water-Supply Paper 396, 6 p., 43 pl.
  Hinrichs, E. N., and others, 1967, Geologic map of the northwest
          quarter of the Hatch Point quadrangle, San Juan County, Utah:
          U.S. Geol. Survey Misc. Geol. Inv. Map I-513.
  ____ 1968, Geologic map of the northeast quarter of the Hatch Point
          quadrangle, San Juan County, Utah: U.S. Geol. Survey Misc.
          Geol. Inv. Map 1-526.
  ____ 1971a, Geologic map of the southeast quarter of the Hatch Point
          quadrangle, San Juan County, Utah: U.S. Geol. Survey Misc.
          Geol. Inv. Map 1-669.
  ____ 1971b, Geologic map of the southwest quarter of the Hatch Point
          quadrangle, San Juan County, Utah: U.S. Geol. Survey Misc.
          Geol. Inv. Map 1-670.
  Hite, R. J., 1968, Salt deposits of the Paradox Basin, southeast Utah
          and southwest Colorado, _in_ Mattox, R. B., ed., Saline
          deposits: Geol. Soc. America Spec. Paper 88, p. 319-330.
  Hunt, Alice, 1956, Archeology of southeastern Utah, _in_ Geology and
          economic deposits of east-central Utah: Intermountain Assoc.
          Petroleum Geologists, 7th Ann. Field Conf., Salt Lake City,
          Utah, 1956, p. 13-18.
  Hunt, C. B., 1969, Geologic history of the Colorado River, _in_ The
          Colorado River region, and John Wesley Powell: U.S. Geol.
          Survey Prof. Paper 669, p. 59-130.
  Jennings, J. D., 1970, Canyonlands--aborigines: Naturalist, v. 21,
          Summer, Spec. Issue 2, p. 10-15.
  Joesting, H. R., and Plouff, Donald, 1958, Geophysical studies of the
          Upheaval Dome area, San Juan County, Utah: Intermountain
          Assoc. Petroleum Geologists, 9th Ann. Field Conf., Salt Lake
          City, Utah, 1958, p. 86-91.
  Joesting, H. R., Case, J. E., and Plouff, Donald, 1966, Regional
          geophysical investigations of the Moab-Needles area, Utah:
          U.S. Geol. Survey Prof. Paper 516-C, 21 p.
  Kolb, E. L., 1927, Through the Grand Canyon from Wyoming to Mexico [2d
          ed.]: New York, Macmillan, 344 p.
  Lansford, Henry, 1972, Boatman in the desert, a passenger-carrying
          stern-wheeler in canyon country: Empire [magazine of the
          Denver Post], Nov. 5, p. 18-19.
  La Rue, E. C., 1916, Colorado River and its utilization: U.S. Geol.
          Survey Water-Supply Paper 395, 231 p.
  ____ 1925, Water power and flood control of Colorado River below Green
          River, Utah, with a forward by Hubert Work, Secretary of the
          Interior, p. 1-100. [App. A, A report on water supply, by E.
          C. La Rue and G. F. Holbrook, p. 101-123; app. B, A geologic
          report on the inner gorge of the Grand Canyon of Colorado
          River, by R. C. Moore, p. 125-171]: U.S. Geol. Survey
          Water-Supply Paper 556, 176 p.
  Lewis, R. Q., and Campbell, R. H., 1965, Geology and uranium deposits
          of Elk Ridge and vicinity, San Juan County, Utah: U.S. Geol.
          Survey Prof. Paper 474-B, 69 p.
  Lohman, S. W., 1965, The geologic story of Colorado National Monument:
          Colo. and Black Canyon Nat. History Assoc., 56 p.
  McKnight, E. T., 1940, Geology of area between Green and Colorado
          Rivers, Grand and San Juan Counties, Utah: U.S. Geol. Survey
          Bull. 908, 147 p.
  Mattox, R. B., 1968, Upheaval Dome, a possible salt dome in the
          Paradox Basin, Utah, _in_ Mattox, R. B., ed., Saline deposits:
          Geol. Soc. America Spec. Paper 88, p. 331-347.
  Mutschler, F. E., 1969, Labyrinth, Stillwater, and Cataract Canyons:
          River runners' guide to the canyons of the Green and Colorado
          Rivers, with emphasis on geologic features, volume II: Denver,
          Colo., Powell Soc., Ltd., 79 p.
  Mutschler, F. E., and Hite, R. J., 1969, Origin of the Meander
          anticline, Cataract Canyon, Utah, and basement fault control
          of Colorado River drainage [abs.]: Geol. Soc. America, Rocky
          Mtn. Sec., 22nd Ann. Mtg., Salt Lake City, Utah, 1969, Abs.
          with Programs, pt. 5, p. 57-58.
  Newberry, J. S., 1861, Geological report, _in_ Ives, J. C., Report
          upon the Colorado River of the West: U.S. 36th Cong. 1st
          sess., S. Ex. Doc. and H. Ex. Doc. 90, pt. 3, 154 p.
  Newell, Maxine, 1970, Canyonlands--modern history: Naturalist, v. 21,
          Summer, Spec. Issue 2, p. 40-47.
  Newman, W. L., 1970, Geologic time: U.S. Geol. Survey, 20 p.
  Porter, Elliot, 1969, Down the Colorado, John Wesley Powell diary of
          the first trip through the Grand Canyon 1869: New York, E. P.
          Dutton & Co., 168 p.
  Powell, J. W., 1875, Exploration of the Colorado River of the West and
          its tributaries: Washington, D.C., 291 p.
  Rabbitt, M. C., 1969, John Wesley Powell: pioneer statesman of federal
          science, _in_ The Colorado River region and John Wesley
          Powell: U.S. Geol. Survey Prof. Paper 669, p. 1-21.
  Sharrock, F. W., 1966, An archeological survey of Canyonlands National
          Park: Utah Univ., Dept. Anthropology, Anthropol. Papers, Misc.
          Paper 83, p. 51-84.
  Stacy, J. R., 1962, Shortcut method for the preparation of
          shaded-relief illustrations, _in_ Short papers in geology,
          hydrology, and topography: U.S. Geol. Survey Prof. Paper
          450-D, p. D164-D165.
  Stokes, W. L., 1970, Canyonlands--geology: Naturalist, v. 21, Summer,
          Spec. Issue 2, p. 3-9.
  Stone, J. F., 1932, Canyon country--The romance of a drop of water and
          a grain of sand: New York, London, G. P. Putnam's Sons, 442 p.
  U.S. Geol. Survey, [1969], John Wesley Powell--soldier, explorer,
          scientist: 23 p.
  Williams, P. L., 1964, Geology, structure, and uranium deposits of the
          Moab quadrangle, Colorado and Utah: U.S. Geol. Survey Misc.
          Geol. Inv. Map I-360.
  Williams, P. L., and Hackman, R. J., 1971, Geology, structure, and
          uranium deposits of the Salina quadrangle, Utah: U.S. Geol.
          Survey Misc. Geol. Inv. Map I-591.
  Wooley, R. R., 1930, The Green River and its utilization: U.S. Geol.
          Survey Water-Supply Paper 618, 456 p.
  Wright, J. C., Shaw, D. R., and Lohman, S. W., 1962, Definition of
          members of the Jurassic Entrada Sandstone in east-central Utah
          and west-central Colorado: Am. Assoc. Petroleum Geologists
          Bull., v. 46, no. 11, p. 2057-2070.


    [Illustration: Petroglyph]




Footnotes


[1]For the benefit of visitors from countries using the metric system,
    the following conversion factors may be helpful: 1 square mile =
    2.590 square kilometers, 1 acre = 0.4047 hectare, 1 inch = 2.54
    centimeters, 1 foot = 0.305 meter, 1 mile = 1.609 kilometers, 1 U.S.
    gallon = 0.00379 cubic meter.

[2]These plastic relief maps, made by the U.S. Army Map Service, can be
    obtained from the T.N. Hubbard Scientific Co., Box 105, Northbrook,
    Ill. 60062. Topographic maps at scales of 1:250,000 and 1:62,500 for
    the entire area, topographic maps at a scale of 1:24,000 for much of
    the area, and a special topographic map of "Canyonlands National
    Park and Vicinity" at a scale of 1:62,500 are available from the
    U.S. Geological Survey, Denver Distribution Section, Federal Center,
    Denver, Colo. 80225, and from privately owned shops where maps are
    sold. A revised edition of the latter, including relief shading,
    will soon be available. An index map of Utah showing all available
    topographic maps is free upon request to the above address.




                                 Index


            [Italic page numbers indicate major references]


                                   A
  Abajo Mountains                                                 21, 113
  Additions to the park                                                 1
  All American Man pictograph                                       9, 70
  Anasazi people                                                9, 12, 68
  Anderson Bottom                                                      93
  Angel Arch                                                       24, 68
  Anticline Overlook                                               31, 50
  Arches                                                           64, 70
      Angel                                                        24, 68
      Canyon Viewpoint                                                 36
      Castle                                                           68
      Druid                                                        24, 76
      Gothic                                                           68
      in Cedar Mesa Sandstone                                     66, 115
      in Navajo Sandstone                                              36
      Little Rainbow Bridge                                            98
      origin                                                           65
      Pinto                                                            98
      Wooden Shoe                                                      66
  Arches National Park                                            28, 116


                                    B
  Beef Basin                                                        9, 75
  Benchlands                                                         _58_
  Bighorn Mesa                                                         46
  Bishop, Francis Marion, quotation                                   106
  Black Canyon of the Gunnison National Monument                      115
  Bonita Bend                                                      57, 93
  Bootlegger Canyon                                                    98
  Bowknot Bend                                                     85, 88
  Bryce Canyon National Park                                          116
  Bureau of Land Management                                            46
  Buttes, Junction                                                     27
      Merrimac and Monitor                                             28
      of the Cross                                                     92
      Turks Head                                               40, 43, 93


                                    C
  Campgrounds, Hatch Point                                             48
      near Green River Overlook                                        43
      Peek-a-boo Spring                                                68
      Squaw Flat                                                    2, 63
      Windwhistle                                                      47
  Cane Creek anticline                                    31, 50, 53, 100
  Canyon de Chelly National Monument                                  115
  _Canyon King_                                                        98
  Canyon Rims Recreation Area                                          47
  Canyon Viewpoint Arch                                                36
  Canyonlands Overlook                                                 48
  Canyonlands Resort                                                2, 63
  Canyons, access roads                                                 8
      Bootlegger                                                       98
      Cataract                                                 5, 85, 108
      Colorado River                                                 _85_
      Cyclone                                                      79, 80
      Davis                                                        64, 70
      Desolation                                                        8
      Elephant                                                         76
      Green River                                                    _85_
      Horse                                                        64, 67
      Horseshoe                                                      1, 9
      Kane Springs                                                     48
      Labyrinth                                                     5, 90
      Lathrop                                                      34, 36
      Lavender                                                     64, 70
      Lockhart                                                         49
      Lower Red Lake                                                   80
      Millard                                                          57
      Mineral                                                          29
      Range                                                            58
      Red Lake                                                         80
      Salt                                                      9, 64, 66
      Sevenmile                                                        28
      Stillwater                                            5, 40, 43, 92
      Taylor                                                           91
      Trough Springs                                                   48
      Upheaval                                                         46
  Capitol Reef National Park                                          115
  Castle Arch                                                          68
  Cataract Canyon                                              5, 85, 108
  Cave Spring Environmental Trail                                  14, 66
  Cave Spring line camp                                             2, 14
  Cedar Breaks National Monument                                      116
  Cedar Mesa Sandstone                                       47, 58, _63_
      arches                                                      66, 115
      potholes                                                     36, 65
  Chesler Park                                                     75, 76
  Chinle Formation                                                    115
      Moss Back Member                                             16, 62
  Church Rock                                                          60
  Climate                                                              23
  Colorado National Monument                                          115
  Colorado Plateau                                            17, 21, 114
  Colorado River                                                _96_, 114
      river runners' guidebook                                          5
  Confluence of Green and Colorado Rivers                     17, 80, 106
  Confluence Overlook                                                  80
  Cutler Formation                                         48, 54, 62, 98
      Cedar Mesa Sandstone Member                                      47
      de Chelly Sandstone Member                                      115
      Organ Rock Tongue                                                40
      White Rim Sandstone Member                                       34
      _See also_ Cedar Mesa Sandstone; White Rim Sandstone.
  Cyclone Canyon                                                   79, 80


                                    D
  Davis Canyon                                                     64, 70
  Dead Horse Point                                            30, 31, 101
  Dead Horse Point State Park                                        _30_
  Desolation Canyon                                                     8
  Devils Kitchen                                                       75
  Devils Lane                                                      75, 80
  Devils Pocket                                                        75
  Dinosaur National Monument                                       8, 114
  Druid Arch                                                       24, 76
  Dugout Ranch                                                     14, 61


                                    E
  Elaterite Basin                                                      58
  Elephant Canyon                                                      76
  Elephant Hill                                                     2, 75
  Entrada Sandstone                                      28, 60, 115, 116
  Entrances, Island in the Sky district                         2, 28, 34
      Needles district                                              2, 60
  Ernies Country                                                       58
  Erosion                                                     21, 64, 114
      landslide                                                       106
      Needles district                                                 63
      rate                                                         21, 90
      volume of rock removed                                      21, 112


                                    F
  Facies changes                                          34, 47, 58, 113
  Faults                                                  48, 63, 79, 104
  Floods                                                               67
  Fort Bottom                                                      91, 92
  Fossils                                                         76, 101
  Four-wheel-drive roads. _See_ Jeep trails.
  Fremont people                                                    9, 12


                                    G
  Gas                                                             53, 112
  Geologic history                                              20, _112_
  Glen Canyon National Recreation Area                                115
  Goblin Valley State Park                                            116
  Goose Neck                                                  30, 31, 101
  Gothic Arch                                                          68
  Grand Canyon National Park                                          115
  Grand (Colorado) River                                           17, 96
  Grand View Point                                                     40
  Grays Pasture                                                    29, 36
  Green River                                                        _87_
      Overlook                                                         43
      River runners' guidebook                                          4
  Ground water                                                     64, 65


                                    H
  Hatch Point                                                        _46_
  Hatch Point Campground                                               48
  Henry Mountains                                                 21, 114
  Hermosa Formation, Paradox Member                           53, 79, 108
  History, Butch Cassidy and his Wild Bunch                    14, 57, 92
      cliff dwellers                                                    9
      cliff dwellings                                                  97
      cowboys                                                      14, 30
      first siting by white man                                         4
      mapping                                                         117
      Powell river expeditions                                      4, 87
      railroads                                                        96
      trapper Julien                                                   90
  Horse Canyon                                                     64, 67
  Horseshoe Canyon                                                   1, 9
  Horseshoe Canyon Detached Unit                                       54
  Horsethief Trail                                             29, 36, 90
  Hurrah Pass                                                      48, 50


                                    I
  Igneous rocks                                                   20, 113
  Indian Creek                                                61, 93, 101
  Indian Creek State Park                                          12, 61
  Indian ruins. _See_ Ruins.
  Indians, Anasazi                                              9, 12, 68
      Fremont                                                       9, 12
      Pueblo                                                            9
      Ute                                                              12
  Iron                                                                 23
  Island in the Sky                                                  _27_


                                    J
  Jackson Hole                                                    90, 100
  Jeep trails, Davis Canyon                                            70
      Elephant Hill                                                 2, 75
      Horse Canyon                                                     67
      Hurrah Pass                                                      48
      Island in the Sky district                                       36
      Lavender Canyon                                                  70
      Needles district                                          2, 63, 75
      Potash area                                                      98
      reason for building                                              16
      Salt Canyon                                                      66
      Silver Stairs                                             2, 79, 80
      SOB Hill                                                      2, 75
      west of Green River                                              54
  Jennings, J. D., quotation                                        9, 12
  Joint Trail                                                          76
  Joints                                                           63, 79
  Julien                                                               90
  Junction Butte                                                       27


                                    K
  Kane Springs Canyon                                                  48
  Kayenta Formation                                           25, 54, 115
  Keyhole Ruin                                                         67
  King's Bottom syncline                                           50, 98


                                    L
  La Sal Mountains                                                21, 113
  Labyrinth Canyon                                                  5, 90
  Lake Powell                                                     23, 108
  Land of Standing Rocks                                               58
  Lathrop Canyon                                                   34, 36
  Lavender Canyon                                                  64, 70
  Little Rainbow Bridge                                                98
  Lockhart Basin                                                       49
  Lockhart Canyon                                                      49
  Lohman, S. W., quotation                                             25
  Lower Red Lake Canyon                                                80


                                    M
  Maps, geologic 117
      satellite image                                                  18
      shaded relief                                                    18
  Meander anticline                                               79, 108
  Merrimac and Monitor Buttes                                          28
  Mesa Trail                                                           36
  Mesa Verde National Park                                            116
  Mesas                                                          _27_, 46
  Metamorphic rocks                                                    21
  Metric conversion factors                                             1
  Millard Canyon                                                       57
  Mineral Canyon                                                       29
  Mines, Atomic King                                                   50
      Mi Vida                                                          16
      potash                                                       53, 98
      School Section                                               13 100
      uranium                                             16, 29, 50, 100
  Moab                                                         16, 86, 96
  Moab anticline                                                       50
  Moenkopi Formation                                          43, 58, 115
  Monument Basin                                                   40, 42
  Monument Valley                                                     115
  Morrison Formation                                                  114
  Moss Back Member of Chinle Formation                             16, 62
  Mutschler, F. E., quotation                                          91


                                    N
  Natural Bridges National Monument                                   115
  Navajo Sandstone                                       46, 98, 115, 116
      arches                                                           36
      color                                                            24
      environment of deposition                                        20
      resistance to erosion                                            25
  Needles district                                                   _60_
  Needles Overlook                                                 42, 47
  Newell, Maxine, quotation                                           100
  Newspaper Rock                                                   12, 61
  North Point                                                          57


                                    O
  Oil                                                        53, 100, 112
  Old Spanish Trail                                               57, 108
  Orange Cliffs                                                      _54_
  Organ Rock Tongue of Cutler Formation                                40
  Overlooks, Anticline                                             31, 50
      Canyonlands                                                      48
      Confluence                                                       80
      Dead Horse Point                                             30, 31
      Grand View Point                                                 40
      Green River                                                      43
      Needles                                                      42, 47
      U-3 loop                                                         49


                                    P
  Paradox Basin                                                       113
  Paradox Member of Hermosa Formation                    53, 79, 108, 113
  Paul Bunyans Potty                                                   67
  Petrified Forest National Park                                      115
  Petroglyphs                                                      12, 97
  Photography                                                           3
      Powell camera stations                                    5, 90, 93
  Picnic sites                                                 36, 46, 75
  Pictographs                                                   9, 12, 70
  Pinto Arch                                                           98
  Porter, Elliot, quotation                                            87
  Potash salts                                                53, 98, 113
  Potholes                                                         36, 65
  Powell, John Wesley                                               4, 87
      John Wesley, quotation                                          106
          river expeditions                                         4, 87
      Memorial Highway                                                  8
  Pueblo people                                                         9


                                    Q
  Quicksand                                                            66


                                    R
  Railroads                                                        96, 98
  Rainbow Bridge National Monument                                    115
  Range Canyon                                                         58
  Red Lake Canyon                                                      80
  Rico Formation                                                  76, 101
  Rincons                                                          86, 90
      Anderson Bottom                                                  93
      Indian Creek                                                93, 101
      Jackson Hole                                                90, 100
  River trips                                                      85, 86
      _Canyon King_                                                    98
      early float                                              87, 88, 96
      guidebooks                                                    4, 88
      Powell expeditions                                            4, 87
      rapids                                                          108
      stern-wheeler                                                    98
  Rivers, Colorado                                              _96_, 114
      Grand (Colorado)                                             17, 96
      Green                                                          _87_
      cutoffs                                                      86, 87
          _See also_ Rincons.
      meanders                                                   85, _86_
  Rock column                                                      20, 31
  Rock folds, anticlines                                               98
      Cane Creek anticline                                31, 50, 53, 100
      Kings Bottom syncline                                        50, 98
      Meander anticline                                           79, 108
      Moab anticline                                                   50
      oil and gas                                                      53
      potash salts                                                     53
      San Rafael Swell                                                116
      Shafer dome                                         31, 49, 53, 101
      synclines                                               43, 49, 100
      Upheaval Dome                                                    43
  Rock fractures, faults                                  48, 63, 79, 104
      joints                                                       63, 79
      origin                                                           79
  Rock inscriptions                                                    12
  Rock layers, dip                                         54, 85, 90, 97
  Rock paintings                                                        9
  Ruin Park                                                         9, 75
  Ruins                                                            64, 70
      Anasazi                                                       9, 68
      Fort Bottom                                                      91
      granaries                                                     9, 68
      Keyhole                                                          67
      Tower                                                         9, 68


                                    S
  Salt beds                                          43, 53, 79, 108, 113
  Salt Canyon                                                   9, 64, 66
  Salt Creek                                                          106
  San Rafael Desert                                                    54
  San Rafael Swell                                                    116
  Sedimentary rocks                                               20, 112
      ages                                                        20, 112
      cement                                                       25, 65
      color                                                            23
      elaterite                                                        58
      environments of deposition                                  20, 113
      facies changes                                      34, 47, 58, 113
      fossils                                                     76, 101
      gypsum                                                      79, 113
      "layer-cake geology"                                             23
      salt                                           43, 53, 79, 108, 113
      sculpture by erosion                                             25
  Sevenmile Canyon                                                     28
  Shafer Basin                                                        100
  Shafer dome                                             31, 49, 53, 101
  Shafer limestone                                                 31, 54
  Shafer Trail                                                         34
  Silver Stairs                                                 2, 79, 80
  Six-Shooter Peaks                                                    61
  SOB Hill                                                          2, 75
  Spanish Bottom                                              80, 85, 108
  Spanish explorers                                                    12
  Springs                                                              36
  Squaw Flat Campground                                             2, 63
  Steer Mesa                                                           46
  Stillwater Canyon                                         5, 40, 43, 92
  Sunset Crater National Monument                                     116


                                    T
  Taylor Canyon                                                        91
  The Doll House                                                       58
  The Fins                                                             58
  The Grabens                                                        _73_
      age                                                              79
      Cyclone Canyon                                               79, 80
      Devils Lane                                                  75, 80
      Devils Pocket                                                    75
      origin                                                           79
  The Loop                                                        85, 104
  The Maze                                                             58
  The Neck                                                         27, 34
  The Needles                                                        _73_
  The Portal                                                           97
  The Slide                                                           106
  The Spur                                                             54
  "Three Worlds"                                                       24
  Thundershowers                                                       67
  Tower Ruin                                                        9, 68
  Trails, Cave Spring Environmental                                14, 66
      foot                                         63, 64, 70, 73, 76, 98
      horse                                                            54
      Horsethief                                               29, 36, 90
      jeep. _See_ Jeep trails.
      Joint                                                            76
      Mesa                                                             36
      Old Spanish                                                 57, 108
      Shafer                                                           34
      to Druid Arch                                                    76
      to Upheaval Dome                                                 46
      White Rim                                                        34
  Transportation in the park                                           26
  Trough Springs Canyon                                                48
  Turks Head                                                   40, 43, 93
  Twain, Mark, quotation                                               87


                                    U
  U-3 loop                                                             49
  Uncompahgre highland                                            54, 113
  Upheaval Canyon                                                      46
  Upheaval Dome                                                        43
  Uranium                                                      16, 34, 97
      mines                                               16, 29, 50, 100
      occurrence                                                   16, 62
  Ute petroglyphs                                                      12


                                    V
  Vegetation, Chesler Park                                             76
      fossil forest                                                   101
      Hatch Point                                                      47
      historical changes                                            5, 90
      Island in the Sky                                                29
      Squaw Flat                                                       63


                                    W
  Wasatch Formation                                                   116
  Water, artesian                                                      91
      floods                                                           67
      ground                                                       64, 65
      Island in the Sky district                                   43, 91
      potholes                                                     36, 65
      quicksand                                                        66
      springs                                                          36
  Whale Rock                                                           46
  White Rim                                                        34, 58
  White Rim Sandstone                                          23, 47, 54
      color                                                            24
      elaterite                                                        58
      potholes                                                         36
      thickness variation                                  23, 34, 40, 43
      water                                                            91
  White Rim Trail                                                      34
  Windwhistle Campground                                               47
  Wingate Sandstone                                       46, 54, 61, 115
      cliff dwellings                                                  97
      petroglyphs                                                  12, 97
      resistance to erosion                                            25
  Wooden Shoe                                                          66
  Wupatki National Monument                                           115


                                    Z
  Zion National Park                                                  115

    [Illustration: DEPARTMENT OF THE INTERIOR · March 3, 1949]




Transcriber's Notes


--Retained publication information from the printed edition: this eBook
  is public-domain in the country of publication.

--Corrected a few palpable typos.

--Included a transcription of the text within some images.

--In the text versions only, text in italics is delimited by
  _underscores_.