Mineral Resources
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Geology
by state
Michigan geologic units
Geologic units in Clinton county, Michigan
Grand River Formation
(Pennsylvanian)
at surface, covers 35 % of this area
Grand River Formation
Red beds
(Jurassic)
at surface, covers 33 % of this area
Red beds
Saginaw Formation
(Pennsylvanian)
at surface, covers 32 % of this area
Saginaw Formation