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Rhyolite to dacite

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Massive to flow-banded rocks of greenschist metamorphic grade in northeastern Wisconsin; virtually undeformed.
State Wisconsin
Name Rhyolite to dacite
Geologic age Early Proterozoic
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanic > Metarhyolite (Greenschist)Massive to flow-banded rocks of greenschist metamprohic grade in northeastern Wisconsin; virtually undeformed
Metamorphic > Metaigneous > Metavolcanic > Metadacite (Greenschist)Massive to flow-banded rocks of greenschist metamprohic grade in northeastern Wisconsin; virtually undeformed
Comments Pembine-Wausau 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 Marinette