Mineral Resources
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Geology
by state
Michigan geologic units
Geologic units in Oscoda county, Michigan
Coldwater Shale
(Mississippian)
at surface, covers 51 % of this area
Coldwater Shale
Marshall Sandstone
(Mississippian)
at surface, covers 33 % of this area
Marshall Sandstone
Michigan Formation
(Mississippian)
at surface, covers 15 % of this area
Michigan Formation
Sunbury Shale
(Mississippian-Devonian)
at surface, covers 0.4 % of this area
Sunbury Shale
Bedford Shale
(Late Devonian)
at surface, covers 0.4 % of this area
Bedford Shale
Antrim Shale
(Late Devonian)
at surface, covers 0.3 % of this area
Antrim Shale