Uintah County is located in the central portion of the Uintah Basin, which extends sixty miles into western Colorado. The northern rim of the basin is formed by the Uintah Mountains, the western rim by the Wasatch Mountains, and the southern rim by the Roan and Book cliffs. The basin is the geological remains of prehistoric Uintah Lake, formed during the late Tertiary period, the same period when sediment was deposited in the lake bottom to form gilsonite, oil shale, tar sands, and oil. Ashley Creek and the White, Uintah, and Green rivers are the major streams in the county. The Green, the largest of the four, slices through the central portion of the county.
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