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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. Crystal Cave in Spring Valley is a significant commercial cave developed in the Ordovician Prairie du Chien Group dolostones and displays speleothems as well as the durst quartz in bugs that give the cave its name. 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.

Note that some localities are named after roads. Be warned that road names in the county have been changed to numbers, with east-west roads being numbered avenues and north-south roads being numbered streets.

Mineral List

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


18 entries listed. 16 valid minerals.

Localities in this Region

USA

The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

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

Cunningham, J, , H. Dolliver & W. Cordua (2011) Flaming meteors, dark caves and raging waters: geological curiosities of western Wisconsin: Miller, et. al. ed. Field guides to the geology of the Mid-Continent of North America: Geological Society of America Field Guide 24: 411-424

External Links

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

Mineral and/or Locality  
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