Mindat Logo

Jackson Co., Wisconsin, USA

Jackson County is underlain by Cambrian sedimentary rocks, dominantly quartz sandstone, with complex Precambrian rocks exposed along deeper river drainages, particularly the Black River. The Precambrian rocks contain some of the oldest rocks in the state, dating from the Archean. These include gneisses and amphibolites severely deformed by the 1.8 billion year old Penokean Orogeny, a continent - continent collision. These are intruded by various pre- , syn- and post-tectonic granitic rocks. Good places to see these rocks are below the dams at Hatfield and Black River Falls. Archean banded iron formation was exposed at the Jackson County Iron mine from 1969 to 1986. The large open pit and dumps are now part of Wazee Lake County Park. The open pit is now a deep lake popular with scuba divers.

Some of the Cambrian quartz sandstone has potential as "frac sand". Locally wavellite and other phosphate mines form veins and cement in the sandstone.

Glacial drift cover is relatively thin, and the landscape is dominated by pleasant buttes or "mounds" underlain by Cambrian strata. Outwash gravel from Pleistocene meltwater can yield some interesting rocks from glacial drift such as copper, banded iron formation and "Lake Superior" agates.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Actinolite
'Albite-Anorthite Series'
'Alkali Feldspar'
'Allanite'
Almandine
Andalusite
Anthophyllite
'Apatite'
'Biotite'
Cacoxenite
Calcite
'Chlorite Group'
Crandallite
Cummingtonite
Epidote
Ferro-Actinolite
Ferro-gedrite
Fluorapatite
Gedrite
Goethite
Graphite
Grunerite
'Halloysite'
Hastingsite
Hematite
'Hornblende'
Ilmenite
Kyanite
Magnetite
Muscovite
Pyrite
Pyrrhotite
Quartz
Riebeckite
'Scapolite'
Sillimanite
Staurolite
Talc
Titanite
Variscite
Wavellite
Zircon


42 entries listed. 33 valid minerals.

Localities in this Region

USA

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

Maas, R. S. & W. R. Van Schmus (1980) Precambrian tectonic history of the Black River Valley: guidebook prepared for the 26th Annual meeting of the Institute on Lake Superior Geology, 43 p.

Brown, B. (editor) 1983, Three billion years of geology: a field trip through the Archean, Proterozoic, Paleozoic and Pleistocene geology of the Black River Falls area of Wisconsin: Wisconsin Geological and Natural History Survey, Field trip Guidebook 9, 51 p.

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

This page is currently not sponsored. To sponsor this page click here.


Mineral and/or Locality  
Search Google  
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.
Current server date and time: July 29, 2014 02:42:33 Page generated: January 19, 2014 03:54:26
Mineral and Locality Search
Mineral:
and/or Locality:
Options
Fade toolbar when not in focusFix toolbar to bottom of page
Hide Social Media Links
Slideshow frame delay seconds