Rhyolite (WIXr;0)

State	Wisconsin
Name	Rhyolite
Geologic age	Early Proterozoic
Original map label	Xr
Comments	Marshfield terrane
Primary rock type	rhyolite
Secondary rock type	mixed clastic/volcanic
Other rock types	granite
Lithologic constituents	Major Sedimentary > Clastic > Mixed-clastic (Tuffaceous)Ash-flow tuffs and interbedded volcaniclastic sedimentary rocks and cogenetic granite (unit Xga) exposed as inliers in southern Wisconsin. In central Wisconsin pink, flow-banded rhyolite and chert-cemented breccia inferred to be 1760 Ma. Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic, ash-flow)Ash-flow tuffs and interbedded volcaniclastic sedimentary rocks and cogenetic granite (unit Xga) exposed as inliers in southern Wisconsin. In central Wisconsin pink, flow-banded rhyolite and chert-cemented breccia inferred to be 1760 Ma. Minor Igneous > Plutonic > Granitic > Granite (Stock or pipe)Ash-flow tuffs and interbedded volcaniclastic sedimentary rocks and cogenetic granite (unit Xga) exposed as inliers in southern Wisconsin. In central Wisconsin pink, flow-banded rhyolite and chert-cemented breccia inferred to be 1760 Ma.
Map 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 [http://pubs.er.usgs.gov/publication/i2185]
Unit 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 [http://pubs.er.usgs.gov/publication/i2185]
Geographic coverage	Columbia - Green Lake - Marquette - Portage - Sauk - Waupaca - Waushara