Mineral Resources
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Geology
by state
Michigan geologic units
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