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Maquoketa Formation

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Shale, dolomitic shale and dolomite; includes overlying Neda Formation (age uncertain) consisting of oolitic iron oxides and shale
State Wisconsin
Name Maquoketa Formation
Geologic age Ordovician
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shaleshale, dolomitic shale and dolomite; includes overlying Neda Formation (age uncertain) consisting of oolitic iron oxides and shale
Sedimentary > Carbonate > Dolostoneshale, dolomitic shale and dolomite; includes overlying Neda Formation (age uncertain) consisting of oolitic iron oxides and shale
References

Mudrey, M.G., Jr., Brown, B.A., and Greenberg, J.K., 1982, Bedrock Geologic Map of Wisconsin: University of Wisconsin-Extension, Geological and Natural History Survey, scale 1:1,000,000.
NGMDB product
Counties Brown - Calumet - Dane - Dodge - Door - Fond du Lac - Grant - Iowa - Jefferson - Kenosha - Kewaunee - Lafayette - Milwaukee - Outagamie - Racine - Walworth - Washington - Waukesha