State | Wisconsin |
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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
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NGMDB product | |
Counties | Forest - Langlade - Marinette - Oconto |