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Geologic units in Kent county, Michigan

Michigan Formation (Mississippian) at surface, covers 31 % of this area

Michigan Formation

Red beds (Jurassic) at surface, covers 25 % of this area

Red beds

Bayport Limestone (Mississippian) at surface, covers 20 % of this area

Bayport Limestone

Saginaw Formation (Pennsylvanian) at surface, covers 19 % of this area

Saginaw Formation

Marshall Sandstone (Mississippian) at surface, covers 5 % of this area

Marshall Sandstone