Usage:
Madison River Basalt (MT*,WY*)
Geologic age:
Quaternary (Pleistocene)*
Type section, locality, area and/or origin of name:
Type area: in uplands west of south end of Gallatin Range, south of upper Maple Creek, in Yellowstone National Park, [Mount Holmes and Madison Junction 15-min quadrangles, Park and Teton Cos.], northwestern WY. Occurs as widely scattered patches. [Named from exposures north of Madison River in Madison Junction 15-min quadrangle, Teton Co., Yellowstone National Park, northwestern WY] (Christiansen and Blank, 1972; see also Christiansen and Blank, 1974, USGS Geol. Quad. Map GQ-1190, scale 1:62,500).
AAPG geologic province:
Yellowstone province*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).