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Geologic units in Otsego county, Michigan

Coldwater Shale (Mississippian) at surface, covers 50 % of this area

Coldwater Shale

Antrim Shale (Late Devonian) at surface, covers 36 % of this area

Antrim Shale

Bedford Shale (Late Devonian) at surface, covers 10 % of this area

Bedford Shale

Ellsworth Shale (Late Devonian) at surface, covers 4 % of this area

Ellsworth Shale