Mineral Resources
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Geology
by state
Michigan geologic units
Geologic units in Allegan county, Michigan
Coldwater Shale
(Mississippian)
at surface, covers 71 % of this area
Coldwater Shale
Marshall Sandstone
(Mississippian)
at surface, covers 29 % of this area
Marshall Sandstone
Michigan Formation
(Mississippian)
at surface, covers 0.2 % of this area
Michigan Formation