| Tonoloway Formation | |
|---|---|
| Stratigraphic range: Pridoli[1] | |
 A Tonoloway limestone "fin" known as Blue Rock, Smoke Hole Canyon, West Virginia | |
| Type | sedimentary |
| Underlies | Keyser Formation |
| Overlies | Wills Creek Formation |
| Thickness | 250+/-20 m |
| Lithology | |
| Primary | limestone |
| Other | shale |
| Location | |
| Region | Appalachian Mountains |
| Extent | Pennsylvania, Maryland, Virginia, West Virginia |
| Type section | |
| Named for | Tonoloway Ridge, Rock Ford, WV |
| Named by | E. O. Ulrich, 1911[2] |
The Late Silurian Tonoloway Formation is a mapped limestone bedrock unit in Pennsylvania, Maryland, Virginia and West Virginia. The Tonoloway is roughly equivalent to the Salina group that is found to the north and west.
- ^ Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
- ^ Ulrich, E.O., 1911, Revision of the Paleozoic systems: Geological Society of America Bulletin, v. 22, p. 281-680.