Metasedimentary rocks, undivided (MNAms;0)

Metasedimentary rocks, undivided - Graywacke, slate, local units of conglomerate, arenite, graphitic slate, fine-grained felsic volcanogenic, and volcaniclastic rocks, lean oxide iron-formation and its metamorphic equivalents. Includes the Knife Lake Group and the Lake Vermilion Formation in northeastern Minnesota.

State	Minnesota
Name	Metasedimentary rocks, undivided
Geologic age	Late Archean
Original map label	Ams
Primary rock type	graywacke
Secondary rock type	slate
Other rock types	metasedimentary rock; felsic metavolcanic rock; iron formation
Lithologic constituents	Major Metamorphic > Metasedimentary Sedimentary > Clastic > Sandstone > Graywacke Incidental Metamorphic > Metasedimentary > Metaclastic > Slate Metamorphic > Metaigneous > Metavolcanic Sedimentary > Chemical > Banded-iron-formation
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 - Clay - Clearwater - Cook - Hubbard - Itasca - Koochiching - Lake - Lake of the Woods - Mahnomen - Norman - Otter Tail - Pennington - Polk - Red Lake - Saint Louis - Wilkin