Usage:
Ra Jadero Tuff of Treasure Mountain Group (CO*)
Geologic age:
early Tertiary (early Oligocene; Rupelian)*
Type section, locality, area and/or origin of name:
Type locality: in Ra Jadero Canyon, Lat. 37 deg. 14 min. N., Long. 106 deg. 16 min. W., about 26 km southeast of Platoro, Conejos Co., southern CO. Named from Ra Jadero Canyon (Lipman and Steven, 1970).
Principal reference section: in cliff exposures along the lower Alamosa River Canyon, southwest of Chiquita Peak, in secs. 24 and 25, T. 36 N., R. 6 E., Conejos Co., southern CO (Lipman, 1975).
AAPG geologic province:
San Juan basin*
San Juan Mountains province*
San Luis 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 ([ ]).