Geologic map of the Thompson Springs quadrangle, Grand County, Utah (M-239) Recreation Books Edward Abbey

Edward Abbey

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This guide includes everything from serene high plains desert hikes in New Mexico and Arizona to trails that take hikers back through time as they reach the ancient ruins in the Utah canyons

Geologic map of the Thompson Springs quadrangle, Grand County, Utah (M-239) Recreation Books Edward AbbeyBy: H. H. Doelling and P. Kuehne The Thompson Springs quadrangle is located in east central Utah along the Interstate 70 (I 70) corridor. The geology is dominated by the Upper Cretaceous Mancos Shale, which was deposited in the Western Interior Seaway. Exposed strata range in age from Late Jurassic to Late Cretaceous and include (in ascending order) the Brushy Basin Member of the Morrison Formation, Cedar Mountain Formation (Yellow Cat, Poison Strip