The Geologic Story of Arches National Park: Geological Survey Bulletin 1393 — John Shaqi
The Geologic Story of Arches National Park: Geological Survey Bulletin 1393Lohman, Stanley William
Science
The Geologic Story of Arches National Park: Geological Survey Bulletin 1393
Lohman, Stanley William
Arches National Park (Utah); Geology -- Utah -- Arches National Park -- Guidebooks
[Illustration: NAVAJO SANDSTONE CLIFFS, bordering west bank of
Colorado River in Courthouse syncline, from State Highway 128 about
2 miles above the Moab bridge. Note rounded domes at top of cliff.
(Fig. 20)]
[Illustration: MOUTH OF SALT WASH, viewed across Colorado River from
point on State Highway 128, 11 miles above Moab bridge. Dark cliffs
on upper right and left are of Wingate Sandstone capped by thin
protective cover of resistant sandstone beds of the Kayenta
Formation. In background Wingate is overlain by entire Kayenta
Formation and lower part of the Navajo Sandstone. Wingate is
underlain to river level by weathered slope of the Chinle Formation.
Water in Salt Wash is largely backwater from the bankfull river;
actual flow in wash generally is much less but at times reaches
flood proportions. (Fig. 21)]
About 11 miles above the Moab bridge is the mouth of Salt Wash (fig. 1),
as viewed from State Highway 128. (See fig. 21.) Seventeen miles above
the bridge (east of area shown in fig. 1), we get an excellent view of
the southeast end of the highly faulted Cache Valley anticline, as shown
in figure 22. The background shown in the photograph formerly was the
easternmost part of the former monument, but when the monument graduated
to a park on November 16, 1971, this part of Cache Valley along with
most of Dry Mesa was withdrawn from the park and put under the
supervision of the Bureau of Land Management, also a part of the
Department of the Interior.
[Illustration: SOUTHEAST END OF FAULTED CACHE VALLEY ANTICLINE,
viewed northwestward across Colorado River from a point on State
Highway 128, 17 miles above Moab bridge. High cliff of Wingate
Sandstone on left is capped by thin protective layer of the Kayenta
Formation. About upper third of slope below base of cliff is the
Chinle Formation, below which is the Moenkopi Formation extending to
high-water level. Note bent and broken beds on right. (Fig. 22)]
As noted on page 16, part of “Run, Cougar, Run” was filmed just upstream
from the irrigated field in the foreground of figure 22, in a wide part
of the valley called Professor Valley (fig. 7). This valley and the
Richardson Amphitheater on the southeast side of the river were named
after a Professor Richardson who settled in the area in the 1880’s. The
long abandoned townsite of Richardson was 1¼ miles due east from the
point from which figure 22 was taken.
Headquarters Area
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