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Quartzite, siltstone, conglomerate, and metavolcanic rocks; Late and Middle Proterozoic, undivided; Atlanta batholith roof pendants

Precambrian, high-grade metamorphic rock
StateIdaho
NameQuartzite, siltstone, conglomerate, and metavolcanic rocks; Late and Middle Proterozoic, undivided; Atlanta batholith roof pendants
Geologic ageLate and Middle Proterozoic, undivided
Original map labelPC; PC2; Y?s; Y1s; Y2s
CommentsZYm includes Belt and Windermere strata, undivided, mostly as roof pendants and septa in the Atlanta lobe of the Idaho batholith (ID005).
Primary rock typequartzite
Secondary rock typemeta-argillite
Other rock typesmetaconglomerate; schist; calc-silicate rock; marble; amphibolite; mafic metavolcanic rock; felsic metavolcanic rock
Lithologic constituents
Major
Metamorphic > Quartzite (Amphibolite)quartzite
Minor
Metamorphic > Marbledolomitic marble
Metamorphic > Hornfels (Amphibolite)calc-silicate rock
Metamorphic > Schist (Amphibolite)mica schist +/- sillimanite, staurolite
Sedimentary > Clastic > Conglomerate (Bed)diamictic meta-conglomerate with metavolc and metased clasts
Incidental
Igneous > Volcanic > Mafic-volcanic
Metamorphic > Phyllite
Metamorphic > Amphibolite (Amphibolite)
Map references
Bond, J.G., Kauffman, J.D., Miller, D.A., and Venkatakrishnan, Ramesh, 1978, Geologic map of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, with contributions from U.S. Geological Survey, scale 1:500,000.
Unit references
Bond, J.G., Kauffman, J.D., Miller, D.A., and Venkatakrishnan, Ramesh, 1978, Geologic map of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, with contributions from U.S. Geological Survey, scale 1:500,000.
Lund, Karen, Aleinikoff, J.N., Evans, K.V., and Fanning, C.M., 2003, SHRIMP U-Pb geochronology of Neoproterozoic Windermere Supergroup, central Idaho; implications for rifting of western Laurentia and synchroneity of Sturtian glacial deposits: Geological Society of America Bulletin, v. 115, no. 3, p. 349-372, 8 figures, 2 tables.
Evans, K.V. and Green, G.N., 2003, Geologic map of the Salmon National Forest and vicinity, east-central Idaho: U.S. Geological Survey Geological Investigations Series I-2765, scale 1:100,000 with pamphlet, 19 p.
Tysdal, R.G., 2000, Revision of Middle Proterozoic Yellowjacket Formation, central Idaho: U.S. Geological Survey Professional Paper 1601-A, p. A1-A13.
Geographic coverageCuster - Idaho - Lemhi - Valley

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