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Clark Co., Wisconsin, USA

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Clark County is underlain by Cambrian sedimentary rocks, dominantly quartz sandstone, with complex Precambrian rocks exposed along deeper river drainages, particularly the Black River. The Precambrian rocks contain some of the oldest rocks in the state, dating from the Archean. These include gneisses and amphibolites severely deformed by the 1.8 billion year old Penokean Orogeny, a continent - continent collision. These are intruded by various pre- ,syn- and post-tectonic granitic rocks. The Precambrian rocks are frequently quarried for crushed stone. Some of the Cambrian quartz sandstone has potential as "frac sand". Some of the more fissile Cambrian sedimentary rocks are useful as flagstone. Glacial drift cover is relatively thin, but outwash gravel from Pleistocene meltwater can yield some interesting rocks from glacial drift such as copper, banded iron formation and "Lake Superior" agates.

Mineral List

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

30 entries listed. 16 valid minerals.

Localities in this Region

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Brown, B. (1988) Bedrock geology of Wisconsin- west central sheet: Wisconsin Geological and Natural History Survey, Map M104, 1 sheet.

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

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