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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
'Albite-Anorthite Series'
'Chlorite Group'
'K Feldspar'
var: Sericite

var: Agate
var: Jasper

17 entries listed. 8 valid minerals.

Localities in this Region


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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 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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