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St. Croix Co., Wisconsin, USA

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 45° North , 92° West (est.)
Margin of Error:~32km

St. Croix County is underlain by Cambrian and Ordovician sedimentary rocks. The Cambrian sediments are largely sandstones, often glauconitic. The Ordovician section tends to be carbonate dominated, with the notable exception of the super-mature St. Peter Sandstone. The carbonates are quarried for crushed stone. Calcite and drusy quartz can be found in these rocks.

Several faults originally of Keweenawan age, but reactived in post-Ordovician time, shift Cambrian and Ordovician strata. The most notable is the Hastings - Hudson Fault, traceable near Hudson and through Willow River State Park.

The Wisconsinan St. Croix moraine cuts through the county near the Interstate 94 corridor. The landscape south of there is bedrock dominated with only thin older glacial drift. North of the interstate the terrain is dominated by glacial landforms. Interesting materials can be found in the glacial drift including iron formation, float copper, omars, jasper and "Lake Superior" agates.

Mineral List

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

11 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.


Hurley,P.M.,Cormier,R.F.,Hower,J.,Fairbairn,H.W.,and Pinson,W.H.,Jr.,(1960) Reliability of glauconite for age measurement by K-Ar and Rb-Sr methods :American Association of Petroleum Geologists Bulletin,v.44,p.1793-1808

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

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