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Dane Co., Wisconsin, USA

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Dane County's bedrock consists of Cambrian and Ordovician sedimentary rocks - primarily quartz sandstones and dolostones. Quarries in the dolostone in particular can yield specimens of calcite, quartz and dolomite. A few fringe deposits of the Upper Mississippi Valley Zinc-Lead District bear small amounts of galena, sphalerite and associated minerals. Glacial deposits, including glacial lake sediments, obscure the bedrock in most of the county. The diamond referred to below is a 4 carat stone found in morainal sediments near the town of Oregon in 1893.

Madison, a dynamic Midwest American city, is Wisconsin's state capital. An array of building stones are visible in the state capital building. Madison also hosts the main campus of the University of Wisconsin System. Weeks Hall contains U.W.-M.'s highly-ranked geology department and the excellent Geology Museum which has a number of programs and public outreach activities. Madison also houses the Wisconsin Geological and Natural History Survey, at which one can obtain publications and maps about all aspects of Wisconsin geology.

Mineral List

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

8 valid minerals.

Rock Types Recorded

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

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Localities in this Region

This page 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.


Heyl, A. & West, W. (1982) Outlying mineral occurrences related to the Upper Mississippi Valley Mineral District, Wisconsin, Iowa, Illinois, and Minnesota: Economic Geology: 77(8): 1803-1817.

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

External Links

U. Wisconsin Geology Museum -

Wisconsin Geological and Natural History Survey

Wisconsin Mineral index - Wisconsin Geological and Natural History Survey

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