Geologic units in Iowa county, Wisconsin

Additional scientific data in this geographic area

Sinnipee Group (Ordovician) at surface, covers 44 % of this area

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

Cambrian, undivided (Cambrian) at surface, covers 21 % of this area

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

Prairie du Chien Group (Ordovician) at surface, covers 18 % of this area

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

Ancell Group (Ordovician) at surface, covers 18 % of this area

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

Maquoketa Formation (Ordovician) at surface, covers 0.2 % of this area

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

Silurian, undivided (Silurian) at surface, covers < 0.1 % of this area

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