Abstract
The area of this report is the SE. part of the Uinta Basin and constitutes about 2,300 sq miles in NE. Utah and NW. Colorado. The oldest rocks exposed are the massive sandstone and variegated shale of the Wasatch Formation of Eocene age. The Wasatch Formation is divided into the main body and the Renegade Tongue (new name). The Wasatch Formation interfingers with and is overlain by the Green River Formation, also of Eocene age. The Green River Formation has been divided, in ascending order, into the Douglas Creek, Garden Gulch, Parachute Creek, and Evacuation Creek Members. The Parachute Creek Member contains the principal oil-shale beds. The Uinta Formation is composed of massive sandstone and arenaceous shale deposited mainly in a fluvial environment. It contains abundant vertebrate fossils. The Uinta is overlain by the red and gray fluvial sandstones and shales of the Duchesne River Formation of Eocene or Oligocene age. Hydrocarbons, in various forms, are abundant in the mapped area. (55 refs.)
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