The deposits here discussed were called the “Uinta Group” by Clarence King in 1878.

The great thickness of reddish sandstones and quartzites of the Paleozoic of the Uinta Mountains were previously, in 1878, named “Uinta” by Powell. It is best, therefore, at present to designate the deposits now under discussion as the “Uinta Group” or the “Uinta Tertiary.”

The Uinta Tertiary has furnished many interesting mammalian and reptilian remains, and several expeditions have been sent into the Uinta Basin to collect fossils. Some of these show that at least part of these deposits are newer than the typical Bridger and older than the White River Oligocene; therefore the name of the group has given the name to a stage in the development of vertebrate life called the “Uinta stage.”

The main area containing the Uinta Group is quite extensive, but lies in one compact body and the boundaries, as . . .

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