Granitic to granodioritic orthogneiss

Granitic to granodioritic orthogneiss. Includes the McGrath Gneiss (~2,752 ± 15, 2,557 Ma) and unnamed units.
State Minnesota
Name Granitic to granodioritic orthogneiss
Geologic age Neoarchean
Lithologic constituents
Metamorphic > Metaigneous > OrthogneissGranitic to granodioritic orthogneiss
Comments Intrusions in all subprovinces of the Superior Province. Foliated to gneissic intrusive complexes and components of batholiths.

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 Aitkin - Chippewa - Crow Wing - Itasca - Kittson - Lac qui Parle - Meeker - Mille Lacs - Morrison - Pine - Roseau - Saint Louis - Sherburne - Stearns - Wright - Yellow Medicine