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Oneida Co., Wisconsin, USA

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Outcrop near Monico

Oneida Co., Wisconsin, USA
Outcrop near Monico

Oneida Co., Wisconsin, USA
Outcrop near Monico

Oneida Co., Wisconsin, USA
Oneida County's bedrock is a poorly exposed complex sequence of Proterozoic granites, meta-volcanic and meta-sedimentary rocks deformed during the 1.80 – 1.85 billion year old Penokean Orogeny. The Penokean orogeny was a continent-continent collision, with the rocks seen in the county being ocean crust and island arc materials caught up in the collision. Several massive sulfide deposits, such as the Lynn and Pelican River deposits, are known, have been explored, but not so far (2013) exploited. Thick glacial drift, lakes and forests make outcrops scarce, but the drift deposits can yield interesting glacial transported rocks and minerals.

Mineral List

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

45 entries listed. 35 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.


LaBerge, G. L., Ed., 1996, Volcanogenic massive sulfide deposits of northern Wisconsin: A commemorative volume: Institute on Lake Superior Geology Proceedings, 42nd Annual Meeting, Cable, WI, v. 42, part 2, 179 p.

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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