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Bois Blanc Formation
Stratigraphic range: Middle Devonian
Type	Formation
Underlies	Onondaga Limestone and Sylvania Sandstone
Overlies	Garden Island Formation and Oriskany Sandstone
Location
Region	Michigan and Ohio
Country	United States

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