First used as lithodemic unit of the Wolf River batholith in central and northeastern WI in the Lake Superior region. Type not designated; derivation of name not stated. Generalized geologic map shows contacts with undifferentiated Paleozoic rocks, Wolf River Quartz Monzonite (new), Waupaca Quartz Monzonite (redescribed), and Precambrian rocks older than 1,450-1,500 m.y. U-Pb concordia intercept age of about 1,500 m.y. is considered most reliable age estimate of the batholith. Is the only unit of the batholith with oscillatory zoning of phenocrysts. Alkali feldspar phenocrysts are subhedral to euhedral rather than ovoidal; phenocryst: matrix ratio of 20:80; planar fabric due to alignment of feldspar phenocrysts. Feldspar phenocrysts (0.5 to 2.0 cm) in medium-grained matrix of idiomorphic to anhedral quartz, feldspar (plagioclase predominant), and biotite, with amphibole locally present. Rapakivi texture present but not conspicuous. Age is Middle Proterozoic.

Source: GNU records (USGS DDS-6; Denver GNULEX).

Is mapped as part of Wolf River batholith in Portage and Marathon Cos, WI in Lake Superior region. Contains subhedral to euhedral, generally unmantled alkali feldspar phenocrysts (0.5-2.0 cm), subordinate euhedral plagioclase and quartz, and rare clusters of biotite with or without hornblende in a finer grained matrix of the same minerals (Anderson, 1980). Is the youngest pluton in the batholith (Anderson, 1980). Formerly called Red River Quartz Monzonite (Van Schmus and others, 1975) and "Red River adamellite" (Anderson, 1980). Is formally redescribed here as Red River Granite, following the classification of Streckeisen (1976). Exposures of the unit along the Red River in the vicinity of the town of Red River, Shawano Co, WI are here designated as the type area. Unit is areally extensive; it crops out intermittently from type area westward into map area, a distance of about 85 km. Age is Middle Proterozoic.

Source: GNU records (USGS DDS-6; Denver GNULEX).