Thunder Bay Limestone
| Thunder Bay Limestone | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Unit of | Traverse Group |
| Sub-units | Partidge Point Member, Potter Farm Member, and Norway Point Member |
| Underlies | Kettle Point Formation and Squaw Bay Limestone |
| Overlies | Potter Farm Formation |
| Thickness | 4.88 metres (16.0 ft) |
| Lithology | |
| Primary | limestone |
| Other | shale |
| Location | |
| Region | Michigan |
| Country | United States |
| Type section | |
| Named for | Thunder Bay (Michigan) |
Thunder Bay Limestone is a geologic formation in Michigan that preserves fossils dating back to the Middle Devonian and is the uppermost formation of the Traverse Group.