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  5. Michigan geologic units

Geologic units in Crawford county, Michigan

Coldwater Shale (Mississippian) at surface, covers 40 % of this area

Coldwater Shale

Michigan Formation (Mississippian) at surface, covers 33 % of this area

Michigan Formation

Marshall Sandstone (Mississippian) at surface, covers 27 % of this area

Marshall Sandstone