Wolf River batholith; Hager Formation; Rhyolite member (WIYh;0)

Wolf River batholith; Hager Formation; Rhyolite member

Gray to reddish-gray, slightly foliated, porphyritic rhyolite containing aligned phenocrysts of alkali feldspar and lesser amounts of plagioclase in a fine-grained matrix of feldspar, biotite, amphibole, and sparse quartz

State	Wisconsin
Name	Wolf River batholith; Hager Formation; Rhyolite member
Geologic age	Middle Proterozoic
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanic > RhyoliteGray to reddish-gray, slightly foliated, porphyritic rhyolite containing aligned phenocrysts of alkali feldspar and lesser amounts of plagioclase in a fine-grained matrix of feldspar, biotite, amphibole, and sparse quartz
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	NGMDB product page for 10177 NGMDB product page for 49339
Counties	Forest - Langlade - Marinette - Oconto