List of holdings from the Silurian
| Epoch/Age | Formation | Location | # of Drawers |
|---|---|---|---|
| Pridoli | Kenneth Limestone | Indiana | 1 |
| Ludlow/Pridoli | Ridgeville Limestone | Indiana | 3 |
| Ludlow/Pridoli | New Corydon Limestone | Indiana | 1 |
| Ludlow/Pridoli | Liston Creek Limestone | Indiana | 2 |
| Ludlow/Pridoli | Kokomo Limestone | Indiana | 3 |
| Ludlow/Pridoli | Huntington Limestone | Indiana | 2 |
| Ludlow/Pridoli | Reef Rock, Wabash Formation | Indiana | 2 |
| Ludlow | Mississinewa Shale | Indiana | 1 |
| Wenlock | Waldron Shale | Indiana | 17 |
| Llandovery/Wenlock | Niagaran | Indiana | 4 |
| Wenlock | Osgood Formation | Indiana | 4 |
| Pridoli | Manlius Limestone | New York | 1 |
| Upper Silurian | Brownsport Group | Tennessee | 11 |
| General Silurian | Miscellaneous | USA | 7 |
| Ludlow | Miscellaneous | USA | 1 |
| Llandovery | Miscellaneous | USA | 1 |
| General Silurian | Miscellaneous | Africa | 1 |
| General Silurian | Miscellaneous | Europe | 1 |
| Lower Silurian | Silurian Bioherms | Canada | 1 |
| General Silurian | Miscellaneous | Canada | 1 |