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Crawford Co., Wisconsin, USA

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The bedrock in Crawford County is Cambrian to Ordovician sedimentary rocks, primarily clean quartz sandstones, limestones, shales and dolostones. Softer Cambrian sandstone underlie valleys, with the more resistant Ordovician rocks holding up highlands. The area is in Wisconsin's "Driftless Area", meaning it apparently missed glaciation during the Pleistocene. River processes have pleasantly carved the landscape into a series of high hills ("mounds") and deep valleys ("coulees"). Scenic bluffs line the Wisconsin and Mississippi River Valleys. Driving the "Great River Road" (Highway 35) as it wends its way along the Mississippi is a great way to enjoy this country.

The carbonate rocks are often quarried, and can yield samples of calcite, dolomite, quartz and marcasite. The County is on the northern fringe of the Upper Mississippi Valley Zinc-Lead District. The district is laterally zoned. In Crawford County the low temperature hydrothermal ore forming fluids resulted primarily in a number of small copper deposits. The mines working these deposits were small, and are now overgrown or reclaimed. Still road cuts, quarries and other excavations hold the promise of uncovering some of these minerals.

Even though in the Driftless Area, deposits from rivers draining glaciated areas to the north and east hold the promise of finding drift copper, "Lake Superior" agates and other minerals in outwash.

Mineral List

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


13 entries listed. 13 valid minerals.

Localities in this Region


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

Heyl, A., Agnew, A., Lyons, E. & Behre C. JR, (1959), The geology of Upper Mississippi Valley Zinc-Lead District: U.S. Geological Survey Professional Paper 309, 310 p.

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

Burgess, Phil (2013) Some representative fossils and minerals of the Prairie du Chien Group in the Upper Mississippi Valley: Rocks and Minerals: 88 (4): 339-342.

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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