Part 4

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.

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).

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).

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.

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).

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 5½ 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, SrSO₄) and barite (barium sulfate, BaSO₄) 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).

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.

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.

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.