Tuff, arkose, claystone, siltstone, conglomerate, lignite; Miocene alluvial and lacustrine deposits (IDTmd;0)

State	Idaho
Name	Tuff, arkose, claystone, siltstone, conglomerate, lignite; Miocene alluvial and lacustrine deposits
Geologic age	Miocene
Original map label	Tmd
Comments	Tmd consists of semi-consolidated tuffaceous clastic sediments and incidental deposits of clay and lignite. Payette Fm is exposed between Weiser and Cambridge, Idaho, as well as in smaller valleys. Sucker Creek Fm is in the Owyhee Mountains. Latah Fm is interlayered with Columbia River Basalt flows in western Idaho.
Primary rock type	tuff
Secondary rock type	arkose
Other rock types	claystone; conglomerate; siltstone; mixed clastic/coal
Lithologic constituents	Major Igneous > Volcanic (Pyroclastic, tuff)tuff and tuffaceous clastic sediments, semi-consolidated Minor Sedimentary > Clastic > Mudstone > Claystone (Bed)lacustrine, derived from laterite and weathered volcanic ash Sedimentary > Clastic > Sandstone > Arkose (Bed)alluvial to lacustrine Incidental Sedimentary > Coal > Lignite (Bed)impure lignite in Payette Fm Sedimentary > Clastic > Siltstone (Bed)alluvial to lacustrine Sedimentary > Clastic > Conglomerate (Bed)alluvial Sedimentary > Clastic > Mudstone > Shale (Bed)lacustrine
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. Alt, David, and Hyndman, D.W., 1995, Northwest Exposures, a Geologic Story of the Northwest: Missoula Montana, Mountain Press Publishing Co., 443 p. Lindgren, Waldemar, 1898, The mining districts of the Idaho Basin and the Boise Ridge, Idaho, with a report on the fossil plants of the Payette formation by F.H., Knowlton: U.S. Geological survey Annual report 18, pt. 3, p. 617-744. Mitchell, V.E., and Bennett, E.H., 1979, Geologic map of the Boise quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Boise 2o Quadrangle, scale 1:250,000. Mitchell, V.E. and Bennett, E.H., Geologic map of the Baker quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Baker 2o Quadrangle, scale 1:250,000.
Geographic coverage	Ada - Adams - Boise - Cassia - Clark - Gem - Idaho - Latah - Owyhee - Payette - Washington