Mafic metavolcanic rocks (MNAmv;0)

Mafic metavolcanic rocks - Dominantly basalt that contains thin sedimentary units, including iron-formation. Includes parts of the Ely Greenstone and the Newton Lake Formation in northeastern Minnesota. Also includes metabasalt exposed in the Minnesota River Valley.

State	Minnesota
Name	Mafic metavolcanic rocks
Geologic age	Late Archean
Original map label	Amv
Primary rock type	basalt
Secondary rock type	sedimentary rock
Other rock types	iron formation; meta-basalt
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Basalt Incidental Sedimentary > Chemical > Banded-iron-formation Sedimentary
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	Becker - Beltrami - Cass - Chippewa - Clay - Clearwater - Cook - Grant - Hubbard - Itasca - Kittson - Koochiching - Lake - Lake of the Woods - Mahnomen - Marshall - Norman - Otter Tail - Pennington - Polk - Red Lake - Renville - Roseau - Saint Louis - Todd - Wadena - Wilkin - Yellow Medicine