| Pointe aux Chenes Formation | |
| Type: | Formation |
| Age: | Silurian |
| Period: | Silurian |
| Unitof: | Bass Islands Group |
| Underlies: | Put-in-Bay Dolomite |
| Overlies: | Pointe aux Chenes Formation |
The St. Ignace Dolomite is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.