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Pierce Co., Wisconsin, USA
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Pierce County is underlain by Cambrian and Ordovician strata, primarily quartz sandstones and dolomitic carbonates. A few isolated outcrops of non-marine Cretaceous strata are known. There is a relatively thin cap of glacial drift left by earlier Pleistocene glaciations. An Ordovician meteor impact structure, the Rock Elm Disturbance, occurs in the eastern part of the County in and north of Nugget Lake County Park. Drusy quartz, dolomite, calcite and goethite pseudomorphs after pyrite occur often in dolostone quarries and outcrops. A few small iron oxide ore deposits were mined from likely Cretaceous lag deposits on top of Ordovician carbonate rocks. The glacial drift hosts a variety of minerals, including drift gold, copper and diamonds, septaria nodules, jasper, banded iron formation and, of course, Lake Superior agates. Several geology displays can be found in the Agriculture and Science Hall on the University of Wisconsin - River Falls campus.

Mineral List

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

17 entries listed. 16 valid minerals.

Localities in this Region


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

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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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