Mineral Resources
Online Spatial Data
Geology
by state
Michigan geologic units
Geologic units in Calhoun county, Michigan
Marshall Sandstone
(Mississippian)
at surface, covers 56 % of this area
Marshall Sandstone
Coldwater Shale
(Mississippian)
at surface, covers 28 % of this area
Coldwater Shale
Saginaw Formation
(Pennsylvanian)
at surface, covers 7 % of this area
Saginaw Formation
Bayport Limestone
(Mississippian)
at surface, covers 5 % of this area
Bayport Limestone
Michigan Formation
(Mississippian)
at surface, covers 4 % of this area
Michigan Formation