Mineral Resources
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Geology
by state
Michigan geologic units
Geologic units in Roscommon county, Michigan
Michigan Formation
(Mississippian)
at surface, covers 48 % of this area
Michigan Formation
Saginaw Formation
(Pennsylvanian)
at surface, covers 36 % of this area
Saginaw Formation
Marshall Sandstone
(Mississippian)
at surface, covers 7 % of this area
Marshall Sandstone
Bayport Limestone
(Mississippian)
at surface, covers 6 % of this area
Bayport Limestone
Red beds
(Jurassic)
at surface, covers 2 % of this area
Red beds
Coldwater Shale
(Mississippian)
at surface, covers 0.4 % of this area
Coldwater Shale