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The Kaiparowits Plateau comprises a 2-km-thick sequence of Upper Cretaceous rocks. The oldest Cretaceous unit in the sequence, the Dakota Formation, has Cenomanian palynomorphs in the middle nonmarine member and late Cenomanian molluscs in the overlying marine member. The Tropic Shale has been dated by marine molluscs as latest Cenomanian to middle Turonian. The Straight Cliffs Formation spans the middle Turonian through the Santonian and has been divided into four members. The Tibbet Canyon Member is of middle Turonian age, based on inoceramid bivalves, and the overlying terrestrial Smoky Hollow Member, though undated, is probably late Turonian in age. An...

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