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Geologic units in Alcona county, Michigan

Coldwater Shale (Mississippian) at surface, covers 65 % of this area

Coldwater Shale

Antrim Shale (Late Devonian) at surface, covers 23 % of this area

Antrim Shale

Marshall Sandstone (Mississippian) at surface, covers 4 % of this area

Marshall Sandstone

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

Bedford Shale

Sunbury Shale (Mississippian-Devonian) at surface, covers 3 % of this area

Sunbury Shale