Cephalopods of middle Late Santonian (Desmoscaphites erdmanni Zone) are found in sandy dolomitic concretion beds in the Mancos Shale from southeast of Green River. These rocks were deposited in the Sevier Foreland Basin.

Reference: Cobban, W. A., 1969, The Late Cretaceous ammonites Scaphites leei Reeside and Scaphites hippocrepis (DeKay) in the Western Interior of the United States, U.S.G.S. Professional Paper 619.

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Scaphites leei Reeside 1927, I  Cobban 1969

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