Usage:
Mexican Spring Formation of Perdido Group (CA*-notably in Cottonwood Mountains area)
Geologic age:
Middle Mississippian (Visean; Meramecian)*
Type section, locality, area and/or origin of name:
Type section: near Mexican Spring, southern Inyo Mountains, about 7.2 km northwest of Cerro Gordo Mine, between 8,920 and 8,970 ft elevation, in T. 15 S., R. 38 E., Lat. 36 deg. 35 min. 48 sec. N., Long. 117 deg. 49 min. 34 sec. W., [Cerro Gordo Peak 7.5-min quadrangle], Inyo Co., eastern CA. Named from Mexican Spring (Stevens and others, 1996).
Reference secion (= type section of Leaning Rock Formation): near Rest Spring in Cottonwood Mountains, about 4 km east of mouth of Perdido Canyon, between 6,160 and 6,240 ft elevation, in northwest corner of sec. 31, T. 13 S., R. 42 E., Lat. 36 deg. 45 min. 30 sec. N., Long. 117 deg. 26 min. 27 sec. W., White Top Mountain 7.5-min quadrangle, Inyo Co., Death Valley National Monument, eastern CA (Stevens and others, 1996).
AAPG geologic province:
Great Basin province*
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 ([ ]).