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.
45 entries listed. 35 valid minerals.
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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.