Bass Islands Formation

Bass Islands Formation
Stratigraphic range: Silurian
TypeFormation
Sub-unitsSt. Ignace Dolomite, Put-in-Bay Dolomite, Tymochtee Dolomite
UnderliesAmherstburg Formation, Columbus Limestone, and Helderberg Group
OverliesSalina Formation
Location
RegionMichigan
CountryUnited States

The Bass Islands Formation is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.