| Alpena Formation | |
| Type: | Formation |
| Age: | Middle Devonian |
| Period: | Middle Devonian |
| Unitof: | Traverse Group |
| Subunits: | Four Mile Dam Member and Newton Creek Member |
| Underlies: | Thunder Bay Limestone |
| Overlies: | Long Lake Limestone |
The Alpena Formation is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.