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Geologic units in Mason county, Michigan

Additional scientific data in this geographic area

Coldwater Shale (Mississippian) at surface, covers 46 % of this area

Coldwater Shale

Marshall Sandstone (Mississippian) at surface, covers 29 % of this area

Marshall Sandstone

Ellsworth Shale (Late Devonian) at surface, covers 21 % of this area

Ellsworth Shale

Michigan Formation (Mississippian) at surface, covers 4 % of this area

Michigan Formation