| Put-in-Bay Dolomite | |
| Type: | Formation |
| Age: | Silurian |
| Period: | Silurian |
| Unitof: | Bass Islands Group |
| Underlies: | Raisin River Dolomite |
| Overlies: | St. Ignace Dolomite |
The Put-in-Bay Dolomite is a geologic formation in Michigan and Ohio. It preserves fossils dating back to the Silurian period. The type locality is South Bass Island in western Lake Erie.