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Columbia Co., Wisconsin, USA
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Columbia County is primarily underlain by Paleozoic sedimentary rocks, with Cambrian strata dominating the west half of the county, and Ordovician strata in the eastern portion. Proterozoic Baraboo Quartzite is exposed at the nose of a large doubly plunging syncline in the western part of the county. Some of the Cambrian quartz sandstone has potential as "frac sand". Some of the more fissile Cambrian sedimentary rocks are useful as flagstone. Ordovician carbonates are also quarried, and can yield cavities with interesting minerals such as calcite, dolomite, drusy quartz and goethite pseudomorphs after marcasite and pyrite. A few,now mostly obliterated lead mines are known from the county, and are probably fringe deposits of the Upper Mississippi Valley zinc-lead district. Glacial lake sediments and outwash gravels are frequently encountered, with till of the Pleistocene Green Bay Lobe important in the east. The Green Bay Lobe shows excellent glacial landforms, especially drumlins.

Mineral List

Mineral list contains entries from the region specified including sub-localities

9 entries listed. 8 valid minerals.

Localities in this Region


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Heyl, A. & W. West, 1982, Outlying mineral occurrences related to the Upper Mississippi Valley Mineral District, Wisconsin, Iowa, Illinois, and Minnesota, Economic Geology: 77(8):1803-1817.

Dott, Robert H. & J.W. Attig, (2004) Roadside Geology of Wisconsin, Mountain Press, 345 p.

External Links

Wisconsin Mineral index - Wisconsin Geological and Natural History Survey http://wgnhs.uwex.edu/wisconsin-geology/minerals-wisconsin/

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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