St. Ignace Dolomite

Pointe aux Chenes Formation
Stratigraphic range: Silurian
Mackinac Breccia, Devonian (St. Ignace Dolomite; Upper Peninsula of Michigan)
TypeFormation
Unit ofBass Islands Group
UnderliesPut-in-Bay Dolomite
OverliesPointe aux Chenes Formation
Location
Region Michigan
Country United States

The St. Ignace Dolomite is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.