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The Geological History of Fossil Butte

Michael Casilliano and Paul Orman McGrew

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Book Excerpt: 
. . .Fig. 2. Geographic features of southwest Wyoming and adjacent areas (from Oriel and Tracey 1970).

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Fig. 3. Physiography of the Fossil Butte National Monument region (from U.S. Department of the Interior 1964).

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Hayden’s report (1871:425-437) included a description of the fish fossils from Petrified Fish Cut by E. D. Cope, a vertebrate paleontologist. Several years earlier Leidy (1856), another paleontologist, described a fish from an unknown locality in the Green River Formation.

Hayden divided this survey area into several districts. The Green River district was put in charge of A. C. Peale. Peale’s (1879:535) report contained the first geologic description of Fossil Butte itself, as well as a short discussion of the fish fossils obtained there. The description of the butte is quoted here:

... In the lower part of the bluff from which these specimens are taken, the bright coloured beds of the Wasatch are. . . Read More