| Bois Blanc Formation | |
| Type: | Formation |
| Age: | Middle Devonian |
| Period: | Middle Devonian |
| Region: | Michigan and Ohio |
| Country: | United States |
| Underlies: | Onondaga Limestone and Sylvania Sandstone |
| Overlies: | Garden Island Formation and Oriskany Sandstone |
The Bois Blanc Formation is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.