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Pepin Co., Wisconsin, USA
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Pepin Co., Wisconsin, USA

Photo: Bill Cordua
Pepin County is underlain by Cambrian and Ordovician strata, primarily quartz sandstones and dolomitic carbonates. There is a relatively thin discontinuous cap of glacial drift left by earlier Pleistocene glaciations, thus the landscape is influenced largely by bed rock. The Ordovician carbonates of the Prairie du Chien Group form the strata on top of the bluffs along the Mississippi, and line the narrow valleys or coulees that drain to the Mississippi. Drusy quartz, dolomite, calcite and goethite pseudomorphs after pyrite and marcasite occur in quarries and outcrops in this strata. Less resistant Cambrian sandstone, often glauconitic underlie the valleys. The glacial drift hosts a variety of minerals, including drift gold, jasper, banded iron formation and "Lake Superior" agates.

Mineral List

Mineral list contains entries from the region specified including sub-localities
var: Lake Superior Agate

5 entries listed. 4 valid minerals.

Localities in this Region


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Dott, Robert H. & J.W. Attig, (2004) Roadside Geology of Wisconsin, Mountain Press, 345 p.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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