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Inoceramus perplexus

Geological Range

Inoceramus perplexus Zone:  Upper Turonian

Turonian to Campanian

Paleogeographic Distribution

Texas to Montana

Stratigraphic Occurrences

Campanian
Pierre Shale (MT)
Turonian
Carlile Shale (SD)
Carlile Shale (Turner Sandy Member) (SD)
Carlile Shale (WY)
Chispa Summit Formation (TX)
Frontier Formation (WY)
Mancos Shale (CO)
Mancos Shale (Juana Lopez Member) (NM)
Mancos Shale (Semilla Sandstone Member) (NM)
Montezuma Valley Formation (CO)
Unknown Stage
Carlile Shale (SD)
Niobrara Formation (CO)
Pierre Shale (WY)
<i>Inoceramus perplexus</i> from the Niobrara Formation (Smoky Hill member) (state unknown) (FHSMIP 659).
Inoceramus perplexus from the Niobrara Formation (Smoky Hill member) (state unknown) (FHSMIP 659).
<i>Inoceramus perplexus</i> from the Niobrara Formation (Fort Hays Member) of Paso County, Colorado (FHSMIP 1761).
Inoceramus perplexus from the Niobrara Formation (Fort Hays Member) of Paso County, Colorado (FHSMIP 1761).
Stratigraphic position unknown
Stratigraphic position unknown