North Shore Volcanic Group; Reversely polarized volcanic rocks, undivided (MNPRmnr;0)

North Shore Volcanic Group; Reversely polarized volcanic rocks, undivided - Mixed tholeiitic diabasic and porphyritic basalt, trachybasalt, and rhyolite in far northeastern Minnesota and porphyritic and diabasic basalt near Duluth. Includes units of a basal quartz arenite, Puckwunge Sandstone and Nopeming Formation, in northeastern Minnesota and near Duluth, respectively.

State	Minnesota
Name	North Shore Volcanic Group; Reversely polarized volcanic rocks, undivided
Geologic age	Middle Proterozoic
Original map label	Pmnr
Primary rock type	basalt
Secondary rock type	trachybasalt
Other rock types	rhyolite; arenite; sandstone
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Basalt Minor Sedimentary > Clastic > Sandstone Sedimentary > Clastic > Sandstone > Arenite Igneous > Volcanic > Mafic-volcanic > Rhyolite
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 - Saint Louis