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Florence Co., Wisconsin, USA

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Complex Precambrian rocks underlie Florence County, which are obscured by thick glacial drift, lakes, forests and marshes. Scattered outcrops and drill core reveal older gneissic terrane overlain by Lower Proterozoic meta-sedimentary and meta-volcanic rocks,such as the Quinnesec Group, likely representing an island arc sequence. These are in turn intruded by various ages of granite. Small copper, molybdenite and iron ore (Menominee Range) deposits have been explored. The best outcrops occur at water falls and dams, such as Lasalle Falls and Pine River. Complex pegmatites, such as the Animikie Red Ace, are exposed and likely represent a more extensive swarm associated with the 1.7 billion year old Hoskins Lake granite. The extensive glacial drift in the County can provide some interesting samples to the diligent collector, including "float" copper, banded iron formation and "Lake Superior" agates.

Mineral List

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


89 entries listed. 66 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.

References

Bayley, R. W., C.E. Dutton, C.A. Lamey, & S.B. Treves (1966) Geology of the Menominee iron-bearing district, Dickinson County, Michigan, and Florence and Marinette counties, Wisconsin: U. S. Geological Survey Professional Paper 1966, 96 p.

Dutton, Carl, (1971) Geology of the Florence Area, Wisconsin and Michigan: U. S. Geological Survey Professional Paper 633, 54 p. and 8 maps.

Cordua, W.S., (1998) Minerals of Wisconsin: Rocks and Minerals 73 (6):378 - 399.

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