Geologic units in Fond du Lac county, Wisconsin

Additional scientific data in this geographic area

Sinnipee Group (Ordovician) at surface, covers 48 % of this area

Dolomite with some limestone and shale; includes Galena, Decorah, and Platteville Formations

Silurian, undivided (Silurian) at surface, covers 41 % of this area

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

Maquoketa Formation (Ordovician) at surface, covers 9 % of this area

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

Ancell Group (Ordovician) at surface, covers 2 % of this area

Orthoquartzitic sandstone with minor limestone, shale and conglomerate; includes Glenwood and St. Peter Formations

Prairie du Chien Group (Ordovician) at surface, covers 0.9 % of this area

Dolomite with some sandstone and shale; includes Shakopee and Oneota Formations

Cambrian, undivided (Cambrian) at surface, covers 0.2 % of this area

Sandstone with some dolomite and shale, undivided; includes Trempealeau, Tunnel City, and Elk Mound Formations