Limestone, slate; Upper Triassic greenschist-facies metamorphic rocks; western Idaho, Blue Mountains island-arc complex; (IDTRwsm;0)

State	Idaho
Name	Limestone, slate; Upper Triassic greenschist-facies metamorphic rocks; western Idaho, Blue Mountains island-arc complex;
Geologic age	Late Triassic
Original map label	TRuw; Jw
Comments	Lund and others (1993) suggest that Martin Bridge and Lucile series lithologies are interfingered throughout the Slate Creek-John Day Creek map area, and should therefore be combined into one unit, the Martin Bridge Formation. Metamorphic grade changes from eastern lower amphibolite-facies to western greenschist-facies.
Primary rock type	limestone
Secondary rock type	slate
Other rock types	shale; dolostone (dolomite); phyllite; marble; skarn (tactite); amphibolite schist; greenschist
Lithologic constituents	Major Sedimentary > Carbonate > Limestone (Lense)Martin Bridge Limestone with local skarns Minor Metamorphic > Phyllite (Greenschist)Lucile slate Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)Hurwal Fm Metamorphic > Slate (Greenschist)Lucile slate Incidental Metamorphic > Schist (Amphibolite, epidote-amphibolite)Lucile slate Metamorphic > Marble (Greenschist)Martin Bridge Limestone Sedimentary > Carbonate > Dolostone (Lense)Martin Bridge Formation Metamorphic > Skarn (Hornfels, hornblende)Martin Bridge Limestone
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. Vallier, T.L., 1977, The Permian and Triassic Seven Devils Group, western Idaho and northeastern Oregon: U.S. Geological Survey Bulletin 1437, 58 p. [http://pubs.er.usgs.gov/publication/b1437] Hamilton, Warren, 1963, Metamorphism in the Riggins region western Idaho: U.S. Geological Survey Professional Paper 436, 95 p., 3 sheets, scales 1:96,000 and 1:250,000. [http://pubs.er.usgs.gov/publication/pp436] Lund, Karen, McCollough, W.F. and Price, E.H., 1993, Geologic map of the Slate Creek-John Day Creek area, Idaho County, Idaho: U.S. Geological Survey Miscellaneous Investigations Series Map, I-2299, 1 sheet, scale 1:50,000. [http://pubs.er.usgs.gov/publication/i2299]
Geographic coverage	Adams - Idaho - Lewis - Nez Perce