Jefferson County is underlain by Ordovician sedimentary rocks, primarily sandstone and dolostones. A few inliers of Precambrian quartzite occur in the northern part of the county, and are quarried just north of the County line in adjacent Dodge County. Glacial sediments, forming world-class landforms such as drumlins, obscure the bedrock in many places, but can yield interesting specimens from the drift.
Mineral ListMineral list contains entries from the region specified including sub-localities
| Muscovite|| Quartz|
2 entries listed. 2 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.
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Locality Updated: Doleritic lava flows, Reyran valley, Fréjus, Var, Provence-Alpes-Côte d'Azur, FranceFrom Pascal Chollet, 10th Dec 2013 21:43:38