| Alpena Formation | |
|---|---|
| Stratigraphic range: Middle Devonian | |
| Type | Formation |
| Unit of | Traverse Group |
| Sub-units | Four Mile Dam Member and Newton Creek Member |
| Underlies | Thunder Bay Limestone |
| Overlies | Long Lake Limestone |
| Location | |
| Region | 
Michigan |
| Country | 
United States |
The Alpena Formation is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
References
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
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