Usage:
Espinaso Formation (NM)
Espinaso Volcanics (NM)
Geologic age:
Tertiary
Oligocene
Type section, locality, area and/or origin of name:
Type locality: Espinaso Ridge along Arroyo Pinovetito. Espinaso de Clotero Montoya (also known as Pinovetito Ridge) is hogback 5 mi long, 11 mi southeast of Cerrillos, Santa Fe Co., northwestern NM. Name credited to Kirk Bryan and J.E. Upson (Stearns, 1943; 1953).
AAPG geologic province:
Estancia basin
San Juan 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 ([ ]).