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Geologic units in Washburn county, Wisconsin
[Additional scientific data in this geographic area]
- Cambrian, undivided (Cambrian) at surface, covers 62 % of this area
Cambrian, undivided - Sandstone with some dolomite and shale, undivided; includes Trempealeau, Tunnel City, and Elk Mound Formations
- Copper Harbor Conglomerate (Middle Proterozoic) at surface, covers 14 % 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.
- Chengwatana Volcanic Group (Middle Proterozoic) at surface, covers 24 % of this area
Chengwatana Volcanic Group - Gray basalt flows, interflow breccia, tuff, and minor sedimentary rocks
- Migmatitic gneiss and amphibolite (Late to Early Archean) (Archean) at surface, covers < 0.1 % of this area
Migmatitic gneiss and amphibolite (Late to Early Archean) - Varied gneisses of mostly unknown age in cores of gneiss domes and fault-bounded uplifts (Archean gneiss terranes). Except for the Watersmeet dome (Late to Early Archean), all dated rocks are Late Archean. Includes granite of Late Archean age that transgresses gneisses and amphibolite.