Waiting for the snow to melt…
The Uinta Basin is a geographic and geologic province in northeastern Utah and northwestern Colorado. It is a structural and topographic basin that is generally contained between the Uinta Mountains and the Book Cliffs. Before coming into its present form in postOligocene time, thick shales and sandstones were deposited during all of Cretaceous time in marine, brackish, and terrestrial waters occupying this area. Depth of sedimentation was largely controlled by (a) downsinking of the geosynclinal trough in the west, (b) positive movement on the Uncompahgre arch, and (c) upper Montana age arching on the Douglas Creek uplift, northern San Rafael Swell, and Monument Peak (Clear Creek) uplift. These and several later movements along the south flank of the Uinta Mountains caused unconformable relationships and overlap of late Cretaceous and Tertiary strat a on the older Cretaceous formations. Previous Geologic Work The first investigation of the Cretaceous coal outcrops was done by Berkey (1905). Weeks (1903) made a revised map of the Uinta Mountains and differentiated previously described formations. Gale (1908) carried his work on coal from the Grand Hogback area in Colorad o into the Uinta Basin. Lupton (1912) carried the coal investigation farther west. Later, important coal investigations were made on the southern margin of the basin in the Book Cliffs area by Clark (1928), Spieker (1931), Erdman (1934), and Fisher (1936). In 1944 Walton described the Cretaceous in detail along the northern
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