Prairie du Chien Group

Dolomite with some sandstone and shale; includes Shakopee and Oneota Formations
State Wisconsin
Name Prairie du Chien Group
Geologic age Ordovician
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone (Bed)
Minor
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Comments On original paper map (WI001), the unit is Opc. The digital file (WI004) symbol is Op.
References
NGMDB product
Counties Buffalo - Columbia - Crawford - Dane - Dodge - Dunn - Fond du Lac - Grant - Green - Green Lake - Iowa - Jefferson - Juneau - La Crosse - Lafayette - Marinette - Monroe - Oconto - Outagamie - Pepin - Pierce - Polk - Portage - Richland - Rock - Saint Croix - Sauk - Shawano - Trempealeau - Vernon - Waupaca - Winnebago - Wood