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Winnebago Co., Wisconsin, USA

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Winnebago County is underlain by Cambrian to Ordovician sedimentary rocks which dip gently east off the Wisconsin Arch. The Ordovician rocks are dominated by carbonates, which are widely quarried for crushed and building stone. Several quarries in the Oshkosh area, such as the Lutz Quarry, are particularly well known for well-crystallized vug minerals including calcite, marcasite, sphalerite and other minerals. Glacial drift covers much of the bedrock. Careful hunting can yield native copper nuggets, banded iron formation, jasper, "Lake Superior" agates and other interesting material from the glacial deposits. The Weis Earth Science Museum on the University of Wisconsin - Fox Valley campus in Menasha features excellent displays, with an emphasis on Wisconsin minerals and geology.

Mineral List

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

18 entries listed. 18 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.


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

External Links

Weis Earth Science Museum

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