Rhyolite ignimbrites; Early Pleistocene felsic volcanics; Yellowstone Plateau (IDQplf;0)

State	Idaho
Name	Rhyolite ignimbrites; Early Pleistocene felsic volcanics; Yellowstone Plateau
Geologic age	Early Pleistocene
Original map label	Qplf
Comments	Qplf is Huckleberry Ridge Tuff, which is mostly light gray rhyolitic ash-flow tuff, isotopically dated 2.0 Ma, and erupted during the first eruptive cycle of the Yellowstone Plateau volcanic field, from the Big Bend Ridge caldera segment of a cauldron complex, southeast of, and much larger than the previously inferred Island Park caldera (ID123).
Primary rock type	rhyolite
Secondary rock type	ignimbrite
Other rock types
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic, ash-flow)Huckleberry Ridge Tuff of Yellowstone Group
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. Mitchell, V.E.., and Bennett, E.H., 1979, Geologic map of the Ashton quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Ashton 2o Quadrangle, scale 1:250,000. Mitchell, V.E., and Bennett, E.H., 1979, Geologic map of the Driggs quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Driggs 2o Quadrangle, scale 1:250,000. Christiansen, R.L., and Blank, H.R., Jr., 1972, Volcanic stratigraphy of the Quaternary rhyolite plateau in Yellowstone National Park: in Geology of Yellowstone National Park: U.S. Geological survey Professional Paper 729-B, p. B1-B18.
Geographic coverage	Bonneville - Caribou - Clark - Fremont - Idaho - Jefferson - Madison - Teton