There are 10 matches
| Collection | Authorizer | Collection name | Reference |
|---|---|---|---|
| 23789 | S. Holland | Sardeson Collection, Pecatonica Formation, Illinois and Iowa Blackriveran - Ordovician 4-5 - Illinois, Iowa | Catalani (1987) |
| 23790 | S. Holland | Sardeson Collection, Mifflin Formation, Illinois and Iowa Blackriveran - Ordovician 4-5 - Illinois, Iowa | Catalani (1987) |
| 23791 | S. Holland | Sardeson Collection, Grand Detour Formation, Illinois and Iowa Blackriveran - Ordovician 4-5 - Illinois, Iowa | Catalani (1987) |
| 23792 | S. Holland | Sardeson Collection, Nachusa Formation, Illinois and Iowa Blackriveran - Ordovician 4-5 - Illinois, Iowa | Catalani (1987) |
| 23794 | S. Holland | Sardeson Collection, Quimbys Mill Formation, Illinois and Iowa Blackriveran - Ordovician 4-5 - Illinois, Iowa | Catalani (1987) |
| 23795 | S. Holland | Sardeson Collection, Spechts Ferry Formation, Illinois and Iowa Blackriveran/Rocklandian - Ordovician 4-5 - Illinois, Iowa | Catalani (1987) |
| 23796 | S. Holland | Sardeson Collection, Guttenberg Formation, Illinois and Iowa Rocklandian/Kirkfieldian - Ordovician 4-5 - Illinois, Iowa | Catalani (1987) |
| 23797 | S. Holland | Sardeson Collection, Ion Formation, Buckhorn Member, Illinois and Iowa Kirkfieldian - Ordovician 4-5 - Illinois, Iowa | Catalani (1987) |
| 23798 | S. Holland | Sardeson Collection, Ion Formation, St. James Member, Illinois and Iowa Kirkfieldian - Ordovician 4-5 - Illinois, Iowa | Catalani (1987) |
| 23799 | S. Holland | Sardeson Collection, Dunleith Formation, Beecher Member, Illinois and Iowa Shermanian - Ordovician 4-5 - Illinois, Iowa | Rice and Hedblom (1987) |