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U.S. National Park Service.

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Yosemite National Park, California. Weather pans (or pits) formed on the summit of North Dome, high above Yosemite Valley. Neighboring pans coalesce as a result of progressive expansion at the expense of intermediate partitions. Photo by U.S. National Park Service. Figure 45, U.S. Geological Survey Bulletin 1595.
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Album caption and index card: Dark Angel, a shaft of the Slick Rock Member, is an erosional remnant of a once high, narrow fin about half a mile northwest of Double O Arch. Arches National Park. Grand County, Utah. n.d. (Photo by National Park Service) Note: Published as figure 57 in U.S. Geological Survey. Bulletin 1393. 1975.
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Album caption and index card: Jointed northeast flank of Salt Valley Anticline, viewed westward. Light-colored wedge in the middle background is Salt Valley anticline, bordered on the extreme left by Klondike Bluffs. Dark-colored fins and pinnacles on left, of Slick Rock Member of the Entrada Sandstone, form Devils Garden. Sharp pinnacle above the valley is the Dark Angel. White bands of sandstone extending to the foreground are composed of Moab Member of the Entrada. Note vegetation in the joints. Arches National Park. Grand County, Utah. n.d. (Aerial photo by U.S. National Park Service) Note: Published as figure 12 in U.S. Geological Survey. Bulletin 1393. 1975.
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