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Geologic units in Saint Croix county, Wisconsin

Additional scientific data in this geographic area

Prairie du Chien Group (Ordovician) at surface, covers 60 % of this area

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

Ancell Group (Ordovician) at surface, covers 20 % of this area

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

Cambrian, undivided (Cambrian) at surface, covers 18 % of this area

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

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

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

Middle and Upper Cambrian (Middle and Upper Cambrian) at surface, covers < 0.1 % of this area

Sandstone, siltstone, and shale; includes the Wonewoc Sandstone, Eau Claire Formation, and Mt. Simon Sandstone.

Upper Cambrian (Upper Cambrian) at surface, covers < 0.1 % of this area

Sandstone, siltstone, shale, and dolostone; includes the Jordan Sandstone and St. Lawrence Formation, and the Mazomanie, Lone Rock, and Davis Formations of the Tunnel City Group.