Geologic units in Newaygo county, Michigan

Michigan Formation (Mississippian) at surface, covers 40 % of this area

Michigan Formation

Saginaw Formation (Pennsylvanian) at surface, covers 32 % of this area

Saginaw Formation

Red beds (Jurassic) at surface, covers 14 % of this area

Red beds

Bayport Limestone (Mississippian) at surface, covers 13 % of this area

Bayport Limestone

Marshall Sandstone (Mississippian) at surface, covers 0.7 % of this area

Marshall Sandstone