Alpena Limestone

Alpena Formation
Stratigraphic range: Middle Devonian
TypeFormation
Unit ofTraverse Group
Sub-unitsFour Mile Dam Member and Newton Creek Member
UnderliesThunder Bay Limestone
OverliesLong 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.