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Didymoceras cochleatum

Geological Range

Campanian

Paleogeographic Distribution

Arkansas to Wyoming to South Dakota

Stratigraphic Occurrences

Campanian
Annona Chalk (AR)
Pierre Shale (SD) [Campanian]
Pierre Shale (WY) [Campanian]
<i> Didymoceras cochleatum </i> from the Pierre Shale Fm. of South Dakota (YPM 86707).
Didymoceras cochleatum from the Pierre Shale Fm. of South Dakota (YPM 86707).
Stratigraphic position unknown
Stratigraphic position unknown