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  5. Michigan geologic units

Geologic units in Tuscola county, Michigan

Saginaw Formation (Pennsylvanian) at surface, covers 53 % of this area

Saginaw Formation

Michigan Formation (Mississippian) at surface, covers 35 % of this area

Michigan Formation

Marshall Sandstone (Mississippian) at surface, covers 6 % of this area

Marshall Sandstone

Bayport Limestone (Mississippian) at surface, covers 6 % of this area

Bayport Limestone