Mineral Resources
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Geology
by state
Michigan geologic units
Geologic units in Ottawa county, Michigan
Marshall Sandstone
(Mississippian)
at surface, covers 52 % of this area
Marshall Sandstone
Michigan Formation
(Mississippian)
at surface, covers 25 % of this area
Michigan Formation
Coldwater Shale
(Mississippian)
at surface, covers 23 % of this area
Coldwater Shale
Bayport Limestone
(Mississippian)
at surface, covers 0.2 % of this area
Bayport Limestone