Mitchell Mesa Rhyolite (TX-local)
Mitchell Mesa Rhyolite of Vieja Group (TX-local)
Mitchell Mesa Welded Tuff of Buck Hill Group (TX-local)
Mitchell Mesa Rhyolite of Buck Hill Group (TX-local)
Recognized in southwestern TX, notably Trans-Pecos area, Chinati Mountains, and Big Bend Ranch State Park.
early Tertiary (Oligocene)
Named from Mitchell Mesa, northwestern Buck Hill quadrangle, Brewster Co., southwestern TX (Goldich and Elms, 1949).
Permian basin
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 ([ ]).