North Shore Volcanic Group; Normally polarized volcanic rocks, undivided (MNPRmnn;0)

North Shore Volcanic Group; Normally polarized volcanic rocks, undivided - Basalt, andesitic basalt, rhyolite and related volcanogenic interflow sedimentary rocks along and inland from the North Shore of Lake Superior.

State	Minnesota
Name	North Shore Volcanic Group; Normally polarized volcanic rocks, undivided
Geologic age	Middle Proterozoic
Original map label	Pmnn
Primary rock type	basalt
Secondary rock type	rhyolite
Other rock types	clastic
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Basalt Minor Sedimentary > Clastic Igneous > Volcanic > Felsic-volcanic > Rhyolite Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite
Map references	Morey, G.B., and Meints, Joyce, 2000, Geologic map of Minnesota - Bedrock Geology: Minnesota Geological Survey, State Map Series, S-20, 3rd edition, scale 1:1,000,000. available online at: http://www.geo.umn.edu/mgs/currentpubs.htm [http://www.geo.umn.edu/mgs/currentpubs.htm]
Unit references	Morey, G.B., and Meints, Joyce, 2000, Geologic map of Minnesota - Bedrock Geology: Minnesota Geological Survey, State Map Series, S-20, 3rd edition, scale 1:1,000,000. available online at: http://www.geo.umn.edu/mgs/currentpubs.htm [http://www.geo.umn.edu/mgs/currentpubs.htm]
Geographic coverage	Cook - Lake - Saint Louis