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Mineral Resources > Online Spatial Data > Geology > by state > Wisconsin Geology

Geologic units in Door county, Wisconsin

[Additional scientific data in this geographic area]

Maquoketa Formation (Ordovician) at surface, covers 4 % of this area

Maquoketa Formation - Shale, dolomitic shale and dolomite; includes overlying Neda Formation (age uncertain) consisting of oolitic iron oxides and shale

Lithology: shale; dolostone (dolomite)

Silurian, undivided (Silurian) at surface, covers 92 % of this area

Silurian, undivided - Dolomite, undivided; includes Cayugan, Niagaran, and Alexandrian series

Lithology: dolostone (dolomite)