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Geologic units in Jackson county, Michigan

Marshall Sandstone (Mississippian) at surface, covers 44 % of this area

Marshall Sandstone

Saginaw Formation (Pennsylvanian) at surface, covers 23 % of this area

Saginaw Formation

Michigan Formation (Mississippian) at surface, covers 17 % of this area

Michigan Formation

Bayport Limestone (Mississippian) at surface, covers 14 % of this area

Bayport Limestone

Coldwater Shale (Mississippian) at surface, covers 1 % of this area

Coldwater Shale