Usage:
Popotosa Formation of Santa Fe Group (NM*)
Geologic age:
early(?) to late Tertiary (late Oligocene(?) to Miocene)*
Type section, locality, area and/or origin of name:
Notable exposures in Silver Creek valley, in T. 1 N., R. 2 W., San Acacia area, Socorro Co., central NM. Named from Arroyo Popotosa [Canada Popotosa, west of Sierra Ladrones, Sevilleta National Wildlife Refuge, San Acacia 7.5-min quadrangle, Socorro Co., central NM] (Denny, 1940).
Principal reference section: Silver Creek, Sevilleta National Wildlife Refuge, [approx.] Lat. 34 deg. 18 min. 00 sec. N., Long. 107 deg. 02 min. 30 sec. W., Riley 15-min quadrangle, Socorro Co., central NM (Asher-Bolinder, 1988).
Reference section: from north edge of Cerritos de las Minas westward to Tortula Springs, central NM (Machette, 1978).
Reference section: Canoncito de las Cabras, in NW/4 SE/4 sec. 13, T. 1 S., R. 1 W., and secs. 17 and 18, T. 1 S., R. 2 W., Magdalena 15-min and Lemitar 7.5-min quadrangles, Socorro Co., central NM (Asher-Bolinder, 1988).
AAPG geologic province:
Orogrande 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 ([ ]).