| Manitoulin Dolomite | |
|---|---|
| Stratigraphic range: Llandovery | |
| Type | Formation |
| Unit of | Cataract Group |
| Underlies | Cabot Head Shale |
| Overlies | Big Hill Formation |
| Location | |
| Region | Ohio, Ontario, and Michigan |
| Country | Canada and United States |
The Manitoulin Dolomite is a geologic formation in Ontario. It preserves fossils dating back to the Silurian period.