There are 6 matches
| Collection | Authorizer | Collection name | Reference |
|---|---|---|---|
| 23753 | S. Holland | Mifflin Formation Cephalopods, Illinois, Iowa, Wisconsin Blackriveran - Ordovician 4-5 - Illinois, Iowa, Wisconsin | Catalani (1987) |
| 23756 | S. Holland | Grand Detour Formation Cephalopods, Illinois, Iowa, Wisconsin Blackriveran - Ordovician 4-5 - Illinois, Iowa, Wisconsin | Catalani (1987) |
| 23757 | S. Holland | Nachusa Formation Cephalopods, Illinois, Iowa, Wisconsin Blackriveran - Ordovician 4-5 - Illinois, Iowa, Wisconsin | Catalani (1987) |
| 23758 | S. Holland | Quimbys Mill Formation Cephalopods, Illinois, Iowa, Wisconsin Blackriveran - Ordovician 4-5 - Illinois, Iowa, Wisconsin | Catalani (1987) |
| 23761 | S. Holland | Spechts Ferry Formation Cephalopods, Illinois, Iowa, Wisconsin Blackriveran/Rocklandian - Ordovician 4-5 - Illinois, Iowa, Wisconsin | Catalani (1987) |
| 24170 | S. Holland | Maquoketa Formation Cephalopods, Iowa Edenian - Ordovician 5 - Iowa | Miller et al. (1954) |