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Oldest gneiss complex - Migmatite

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Wind River Range--Includes large bodies of metagabbro. Overprint pattern indicates area of migmatite related to emplacement of 2,600-Ma granite.
State Wyoming
Name Oldest gneiss complex - Migmatite
Geologic age Early Archean
Lithologic constituents
Major
Metamorphic > Migmatite
Metamorphic > Metaigneous > Metaintrusive > Metagabbro
Comments This unit represents the 'overprint pattern' on unit Ugn. Unit description suggests these are migmatic regions.
References

Love, J.D. and Christiansen, A.C., 1985, Geologic Map of Wyoming: U.S. Geological Survey, scale 1:500,000.

https://pubs.er.usgs.gov/publication/70046739
NGMDB product
Counties Fremont - Sublette