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Didymoceras cheyennense

Geological Range

Didymoceras cheyennense Zone: Upper Campanian 74.67 ± 0.15

Campanian to Maastrichtian

Paleogeographic Distribution

South Dakota

Stratigraphic Occurrences

Maastrichtian
Fox Hills Formation (SD)
Campanian
Pierre Shale (SD) [Campanian]
Holotype of <i>Didymoceras cheyennense</i> (USNM 470). Original unmodified images provided by courtesy of the Smithsonian NMNH and adapted and presented here under a Creative Commons BY-NC 4.0 license (NMNH GUID http://n2t.net/ark:/65665/31add8dac-cf4e-4ae3-bd59-42469841be30).
Holotype of Didymoceras cheyennense (USNM 470). Original unmodified images provided by courtesy of the Smithsonian NMNH and adapted and presented here under a Creative Commons BY-NC 4.0 license (NMNH GUID http://n2t.net/ark:/65665/31add8dac-cf4e-4ae3-bd59-42469841be30).
Stratigraphic position unknown
Stratigraphic position unknown