Usage:
Gillespie Tuff (NM)
Geologic age:
early Tertiary (Oligocene)
Type section, locality, area and/or origin of name:
Named from exposures on Gillespie Mountain, in sec. 33, T. 30 S., R. 18 W., Walnut Wells quadrangle, Hidalgo Co., southwestern NM (Zeller and Alper, 1965).
AAPG geologic province:
Pedregosa 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 ([ ]).