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Jackson Co., Wisconsin, USA

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 44° 17' 26'' North , 90° 43' 23'' West (est.)
Margin of Error:~0km

Jackson 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. Good places to see these rocks are below the dams at Hatfield and Black River Falls. Archean banded iron formation was exposed at the Jackson County Iron mine from 1969 to 1986. The large open pit and dumps are now part of Wazee Lake County Park. The open pit is now a deep lake popular with scuba divers. Smaller deposits of iron ore were sporadically in the area dating back as far back as 1857.

Some of the Cambrian quartz sandstone has potential as "frac sand". Locally wavellite and other phosphate minerals form veins and cement in the sandstone.

Glacial drift cover is relatively thin, and the landscape is dominated by pleasant buttes or "mounds" underlain by Cambrian strata. 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

33 valid minerals.

Localities in this Region

This page 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.


Maas, R. S. & W. R. Van Schmus (1980) Precambrian tectonic history of the Black River Valley: guidebook prepared for the 26th Annual meeting of the Institute on Lake Superior Geology, 43 p.

Brown, B. (editor) 1983, Three billion years of geology: a field trip through the Archean, Proterozoic, Paleozoic and Pleistocene geology of the Black River Falls area of Wisconsin: Wisconsin Geological and Natural History Survey, Field trip Guidebook 9, 51 p.

Dott, R. H & J. W. Attig (2004) Roadside Geology of Wisconsin: Mountain Press, 346 p.

External Links

Wisconsin Mineral index - Wisconsin Geological and Natural History Survey

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