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Wolf River Batholith; Anorthosite

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Gray, coarse-grained (1-20 cm) plagioclase-rich (An45-53) rock containing interstitial orthopyroxene, clinopyroxene, Fe-Ti oxides, and apatite.
State Wisconsin
Name Wolf River Batholith; Anorthosite
Geologic age Middle Proterozoic
Lithologic constituents
Major
Igneous > Plutonic > AnorthositeGray, coarse-grained (1-20 cm) plagioclase-rich (An45-53) rock containing interstitial orthopyroxene, clinopyroxene, Fe-Ti oxides, and apatite
References

Van Schmus and others , 1975, Geology and age of the Wolf River batholith, Wisconsin: Geological Society of America Bullein, v. 86, p. 907-914.

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 Langlade - Marathon - Menominee - Portage - Shawano