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Geologic formation in Michigan From Wikipedia, the free encyclopedia
The Alpena Formation is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
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 |
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