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  5. Michigan geologic units

Geologic units in Iosco county, Michigan

Michigan Formation (Mississippian) at surface, covers 41 % of this area

Michigan Formation

Marshall Sandstone (Mississippian) at surface, covers 33 % of this area

Marshall Sandstone

Coldwater Shale (Mississippian) at surface, covers 26 % of this area

Coldwater Shale