Inoceramus fragilis

Geological Range

Cenomanian to Coniacian

Texas to Montana

Coniacian: Niobrara Formation (Smoky Hill Member) (KS); Niobrara Formation (MT)
Turonian: Carlile Shale (NE); Carlile Shale (SD); Carlile Shale (Turner Sandy Member) (SD); Cody Shale (WY)
Cenomanian: Woodbine Formation (TX); Woodbine Formation (Templeton Member) (TX)
Unknown Stage: Benton Shale (CO); Benton Shale (NE); Benton Shale (WY); Britton Formation (TX); Carlile Shale (SD); Codell Shale (CO); Frontier Formation (WY); Mancos Shale (NM); Niobrara Formation (CO)