Alpena Limestone

The Alpena Formation is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.

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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

References

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.