State | Wisconsin |
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Name | Migmatitic gneiss and amphibolite (Late to Early Archean) |
Geologic age | Archean |
Lithologic constituents |
Major
Metamorphic > GneissMigmatitic gneiss. Varied gneisses of mostly unknown age in cores of gneiss domes and fault-bounded uplifts (Archean gneiss terranes). Except for the Watersmeet dome (Late to Early Archean); all dated rocks are Late Archean. Includes granite of Late Archean age that transgresses gneisses and amphibolite.
Metamorphic > AmphiboliteMigmatitic amphibolite
Minor
Igneous > Plutonic > Granitic > GraniteIncludes granite of Late Archean age that transgresses gneisses and amphibolite.
|
Comments | Continental margin assemblage (north of Niagara Fault) |
References | |
NGMDB product | |
Counties | Ashland - Bayfield - Iron - Price - Sawyer - Vilas - Washburn |