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  5. Michigan geologic units

Geologic units in Arenac county, Michigan

Michigan Formation (Mississippian) at surface, covers 68 % of this area

Michigan Formation

Saginaw Formation (Pennsylvanian) at surface, covers 28 % of this area

Saginaw Formation

Marshall Sandstone (Mississippian) at surface, covers 3 % of this area

Marshall Sandstone

Coldwater Shale (Mississippian) at surface, covers 2 % of this area

Coldwater Shale