Rock pinnacles in Split Mountain Canyon, Green River. Dinosaur National Monument. Uintah County, Utah. July 1871.
USGS Earth Science Photographic Archive digital file: hjk00700

Cliffs of Weber Sandstone (Pennsylvanian and Permian age) form the canyon rim throughout the Split Mountain.

U.S. Department of the Interior - U.S. Geological Survey - Geology Discipline
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