Granitic orthogneiss and migmatite

Granitic orthogneiss and migmatite. Geophysical map patterns imply this unit intruded other gneisses.
State Minnesota
Name Granitic orthogneiss and migmatite
Geologic age Mesoarchean to Paleoarchean
Lithologic constituents
Metamorphic > Metaigneous > OrthogneissGranitic orthogneiss
Metamorphic > Migmatite
Comments Part of the Minnesota River Valley subprovince (~3,100 to 3,500 Ma) of west-central and southwestern Minnesota; which includes the Montevideo, Morton, and related gneisses.

Jirsa, Mark A., Boerboom, Terrence J., Chandler, Val W., Mossler, John H., Runkel, Anthony C., and Setterholm, Dale R., 2011, S-21 Geologic Map of Minnesota-Bedrock Geology; Minnesota Geological Survey, State Map Series S-21. Scale 1:500,000.

NGMDB product
Counties Big Stone - Brown - Chippewa - Kandiyohi - Lac qui Parle - Lyon - McLeod - Meeker - Morrison - Murray - Nicollet - Pope - Redwood - Renville - Sibley - Stearns - Stevens - Swift - Todd - Yellow Medicine