Usage:
No current usage.
(†/Chinati Mountains Group (TX) not used. Informal "rocks of the Chinati Mountains caldera" used instead.)
[A "group" consists of 2 or more formations (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021).]
Geologic age:
early Tertiary (Oligocene)
Type section, locality, area and/or origin of name:
Type locality: at base of east scarp of Chinati Mountains, 1.5 mi west of Cibolo Ranch headquarters. Named for thick section of lava flows which form Chinati Mountains, Chinati Peak quadrangle, Presidio Co., TX (Rix, 1953).
AAPG geologic province:
Permian 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 ([ ]).