Garnet-sillimanite-biotite schist; Middle Proterozoic Prichard Formation, northern Belt province (IDY1nmh;0)

State	Idaho
Name	Garnet-sillimanite-biotite schist; Middle Proterozoic Prichard Formation, northern Belt province
Geologic age	Early Middle Proterozoic
Original map label	PC1; mig
Comments	Y1nmh is mostly coarsely crystalline biotite schist +/- garnet and sillimanite, and minor biotitic quartzite
Primary rock type	schist
Secondary rock type	gneiss
Other rock types	quartzite
Lithologic constituents	Major Metamorphic > Schist (Amphibolite)garnet-sillimanite-biotite schist Minor Metamorphic > Quartzite (Amphibolite)biotitic quartzite Metamorphic > Gneiss (Amphibolite)biotite gneiss
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. Lewis, R.S., 2003, Unpublished report on IGS digital geologic maps in preparation, north-central Idaho: Moscow, Idaho, Idaho Geological Survey, 1:100,000 scale. Heitanen, Anna, 1963, Metamorphism of the Belt Series in the Elk River-Clarkia area Idaho; metamorphic and igneous rocks along the northwest border zone of the Idaho batholith: U.S. Geological Survey Professional Paper 344-C, 49 p., map scale 1:48,000. [http://pubs.er.usgs.gov/publication/pp344C]
Geographic coverage	Clearwater - Idaho - Shoshone