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Monroe Co., Wisconsin, USA

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Monroe County is underlain mainly by Cambrian sedimentary rocks such as quartz sandstone. Ordovician dolomitic carbonates top the highlands in the southern half of the county. The dolostones are often quarried for road metal and other uses. Some remanent outliers of Cretaceous continental sediments (Windrow Formation)are known. The County is mostly in the Driftless Area, hence topography is dominated by bedrock resistance. Erosion has carved the rocks into scenic bluffs and glens (locally called coulees). The floor of Glacial Lake Wisconsin gives rise to some interesting topography in the northeastern corner of the county where Cambrian sandstone "sea stacks" in the lake are preserved as isolated bluffs, such as in Mill Bluff State Park.

Mineral List

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

5 entries listed. 4 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.


Thwaites, W. H. & F. T. Twenhofel (1921) Windrow Formation: an upland gravel formation of the driftless and adjacent areas of the upper Mississippi Valley: Geological Society of America Bulletin: 32 (2): 293-314.

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

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