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Trempealeau Co., Wisconsin, USA

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Trempealeau County Coulee Country

Trempealeau Co., Wisconsin, USA
Trempealeau County Coulee Country

Trempealeau Co., Wisconsin, USA
Trempealeau County Coulee Country

Trempealeau Co., Wisconsin, USA
 
 
Trempealeau County is underlain by undisturbed Cambrian and Ordovician sedimentary rocks. The Ordovician rocks are primarily the Prairie du Chien group, which is mostly resistant dolostone and is widely quarried. These rocks can yield drusy quartz, calcite and goethite pseudomorphs after pyrite and marcasite. The Cambrian rocks are dominantly quartz sandstones that are currently actively sought for "frac sand". The Cambrian also includes some glauconitic sandstone, shales and slab by siltstones The siltstones are often used as small quarries for local rip rap and building materials. These rocks are well-exposed along the Mississippi River, especially in Perrot State Park. The deeply dissected "coulee country" alone the Trempealeau River and its tributaries abounds with quarries, especially in the Arcadia, Whitehall and Mondovi areas, but few have been checked for minerals. The County was glaciated, but only by some of older Pleistocene glaciations, so glacial drift cover is sparse. Where glacial drift is found, or in deposits from rivers draining glaciated areas one may occasionally find nice "Lake Superior" agates, as well as drift copper, banded iron formation, jasper and many other rocks.

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USA

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References

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 http://wgnhs.uwex.edu/wisconsin-geology/minerals-wisconsin/

Mineral and/or Locality  
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