Geologic units in Burnett county, Wisconsin

Copper Harbor Conglomerate (Middle Proterozoic) at surface, covers 21 % of this area: Copper Harbor Conglomerate - Red lithic conglomerate and sandstone; mafic to felsic volcanic flows similar to those of the unnamed formation (unit Yu) are interlayered with the sedimentary rocks.
Lithology: conglomerate; sandstone; basalt
Chengwatana Volcanic Group (Middle Proterozoic) at surface, covers 60 % of this area: Chengwatana Volcanic Group - Gray basalt flows, interflow breccia, tuff, and minor sedimentary rocks
Lithology: basalt
Cambrian, undivided (Cambrian) at surface, covers 19 % of this area: Cambrian, undivided - Sandstone with some dolomite and shale, undivided; includes Trempealeau, Tunnel City, and Elk Mound Formations
Lithology: sandstone; dolostone (dolomite); shale
Upper Cambrian, undivided (Late Cambrian) at surface, covers < 0.1 % of this area: Upper Cambrian, undivided - Jordan Sandstone; dolomite, glauconite, and silty glauconite rocks of the St. Lawerence and Franconia Formation; Ironton and Galesville Sandstones; sandy and shaly rocks of the Eau Claire Formation; and the Mt. Simon Sandstone.
Lithology: dolostone (dolomite); sandstone; shale
Chengwatana Volcanic Group (Middle Proterozoic) at surface, covers < 0.1 % of this area: Chengwatana Volcanic Group - Basalt and related volcanogenic and interflow sedimentary rocks in east-central Minnesota
Lithology: basalt; rhyolite; clastic