Usage:
Big Rock Formation of Vadito Group (NM-local)
Big Rock Conglomerate Member of Burned Mountain Metarhyolite (NM*-local)
Recognized locally in Tusas Mountains area.
Geologic age:
late Paleoproterozoic*
Type section, locality, area and/or origin of name:
Type section: Mesa de la Jarita, in secs. 22 and 29 [27?], T. 27 N., R. 8 E., Las Tablas 7.5-min quadrangle, Rio Arriba Co., [Carson National Forest area], central northern NM (Bauer and Williams, 1989).
Principal reference section (=type locality of Barker corrected): on northwest-trending ridge in NW/4 sec. 27, T. 27 N., R. 8 E., southeast of 8,715 ft elevation, about 1.2 mi (2 km) southwest of Big Rock, Las Tablas 7.5-min quadrangle, Rio Arriba Co., [Mesa de la Jarita, Carson National Forest area], central northern NM (Wobus, 1985).
Type locality: in SE/4 sec. 27, T. 27 N., R. 8 E., [about 1.5 mi southwest of Big Rock], Las Tablas 7.5-min quadrangle, Rio Arriba Co., [Carson National Forest area], central northern NM (Barker, 1970).
Named from Big Rock, in sec. 23, T. 27 N., R. 8 E., Las Tablas 7.5-min quadrangle, Rio Arriba Co., [Carson National Forest area], central northern NM (Barker, 1958, 1970).
AAPG geologic province:
Southern Rocky Mountain region*
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 ([ ]).