There are 5 matches
| Collection | Authorizer | Collection name | Reference |
|---|---|---|---|
| 23116 | S. Holland | Guttenberg Formation, Iowa and Wisconsin Rocklandian - Ordovician 4-5 - Iowa/Wisconsin | DeMott (1987) |
| 23118 | S. Holland | Quimbys Mill Formation, Iowa and Wisconsin Blackriveran - Ordovician 4-5 - Iowa/Wisconsin | DeMott (1987) |
| 23119 | S. Holland | Grand Detour Formation, Iowa and Wisconsin Blackriveran - Ordovician 4-5 - Iowa/Wisconsin | DeMott (1987) |
| 23120 | S. Holland | Mifflin Formation, Iowa and Wisconsin Blackriveran - Ordovician 4-5 - Iowa/Wisconsin | DeMott (1987) |
| 23121 | S. Holland | Pecatonica Formation, Iowa and Wisconsin Blackriveran - Ordovician 4-5 - Iowa/Wisconsin | DeMott (1987) |