Mafic metavolcanic rocks (WIXmi;0)

State	Wisconsin
Name	Mafic metavolcanic rocks
Geologic age	Early Proterozoic
Original map label	Xmi
Comments	Pembine-Wausau terrane
Primary rock type	basalt
Secondary rock type	andesite
Other rock types	gabbro; ultramafic intrusive rock
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow)Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation. Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation. Minor Igneous > Plutonic > Ultramafic (Flow)Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation. Metamorphic > Metaigneous > Metaintrusive > MetagabbroDominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation. Incidental Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Pyroclastic, tuff)Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation. Igneous > Volcanic > Mafic-volcanic > Basalt (Pyroclastic, tuff)Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation.
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	Barron - Florence - Forest - Iron - Langlade - Lincoln - Marathon - Marinette - Oneida - Price - Rusk - Sawyer - Taylor - Vilas