Usage:
Cerro Toledo Rhyolite of Tewa Group (NM*)
Cerro Toledo B ash bed (informal) (KS*-recognized locally in Meade Co.)
Cerro Toledo X ash bed (informal) (TX*-recognized locally in Briscoe Co.)
Ash beds are downwind equivalents of Cerro Toledo Rhyolite.
For informal usage, the rank or lithologic term should not be capitalized.
Geologic age:
Quaternary (Pleistocene)*
Type section, locality, area and/or origin of name:
Type locality: on northeast side of Valles Caldera in steep forested northwestward-trending ridge, the Sierra de Toledo, btw. Rito de los Indos and Valle de los Posos, Los Alamos area, north-central NM. Named from Cerro Toledo, a peak in the Sierra de los Valles, northwest of the Valles Caldera (Griggs and Hem, 1964).
AAPG geologic province:
Anadarko basin*
Palo Duro 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 ([ ]).