Cephalopods of early Late Santonian age are found in sandy dolomitic concretion beds in the Mancos Shale from east of Woodside. These rocks were deposited in the Sevier Foreland Basin.

Reference: Cobban, W. A., 1951, Scaphitoid Cephalopods of the Colorado Group, U.S.G.S. Professional Paper 239.

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Clioscaphites choteauensis Cobban 1951

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