Ostrea congesta
Geological Range
Cenomanian to Maastrichtian
Paleogeographic Distribution
New Mexico to Montana
Stratigraphic Occurrences
- Campanian
- Pierre Shale (SD) [Campanian]
- Santonian
- Mesaverde Formation (NM)
- Niobrara Formation (CO)
- Niobrara Formation (Smoky Hill) (KS)
- Coniacian
- Niobrara Formation (Fort Hays Member) (CO)
- Niobrara Formation (KS)
- Niobrara Formation (Smoky Hill Member) (KS)
- Niobrara Formation (SD)
- Turonian
- Carlile Shale (KS)
- Carlile Shale (Blue Hill Shale Member) (KS)
- Carlile Shale (Fairport Member) (KS)
- Cenomanian
- Graneros Shale (KS)
- Unknown Stage
- Fox Hills Formation (MT)
- Niobrara Formation (CO)
- Niobrara Formation (NE)
- Niobrara Formation (WY)
