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Fault rocks

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Mylonitic rocks of uncertain lithology in Eau Pleine shear zone
State Wisconsin
Name Fault rocks
Geologic age Archean to Early Proterozoic
Lithologic constituents
Major
Tectonite > Mylonite
Comments Marshfield terrane
References

Sims, P.K., 1992, Geologic map of Precambrian rocks, southern Lake Superior region, Wisconsin and northern Michigan: U.S. Geological Survey Miscellaneous Investigations Map I-2185, scale 1:500,000.

https://pubs.er.usgs.gov/publication/i2185
NGMDB product
Counties Marathon - Portage