Mineral Resources
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Geology
by state
Michigan geologic units
Geologic units in Kalkaska county, Michigan
Coldwater Shale
(Mississippian)
at surface, covers 54 % of this area
Coldwater Shale
Michigan Formation
(Mississippian)
at surface, covers 21 % of this area
Michigan Formation
Marshall Sandstone
(Mississippian)
at surface, covers 19 % of this area
Marshall Sandstone
Ellsworth Shale
(Late Devonian)
at surface, covers 3 % of this area
Ellsworth Shale
Antrim Shale
(Late Devonian)
at surface, covers 2 % of this area
Antrim Shale