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| Pointe aux Chenes Formation | |
|---|---|
| Stratigraphic range: Silurian | |
 Mackinac Breccia, Devonian (St. Ignace Dolomite; Upper Peninsula of Michigan) | |
| Type | Formation |
| Unit of | Bass Islands Group |
| Underlies | Put-in-Bay Dolomite |
| Overlies | Pointe aux Chenes Formation |
| Location | |
| Region | Michigan |
| Country | United States |
The St. Ignace Dolomite is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.
