Geologic units in Menominee county, Wisconsin

Wolf River batholith; Wolf River Granite (Middle Proterozoic) at surface, covers 78 % of this area

Red, coarse-grained rapakivi granite consisting of large (1-3 cm) ovoid alkali feldspar sporadically mantled by plagioclase, interstitial plagioclase, quartz, biotite, hornblende, and ilmenite

Wolf River Batholith; Anorthosite (Middle Proterozoic) at surface, covers 13 % of this area

Gray, coarse-grained (1-20 cm) plagioclase-rich (An45-53) rock containing interstitial orthopyroxene, clinopyroxene, Fe-Ti oxides, and apatite.

Wolf River batholith; Red River Granite (Middle Proterozoic) at surface, covers 9 % of this area

Contains alkali feldspar phenocrysts (0.5-2 cm), subordinate plagioclase and quartz, and rare clusters of biotite with or without hornblende

Wolf River Batholith; Belongia Granite (Middle Proterozoic) at surface, covers < 0.1 % of this area

Red to pink granite consisting of both a coarse-grained and a fine-grained facies. Probably an epizonal intrusion