Usage:
/Black Mountain Andesite (AZ,NM?)
[Preoccupied. Name previously applied to Black Mountain Basalt Flow by Baker (1912) in CA.]
Geologic age:
late Tertiary (Miocene)
Type section, locality, area and/or origin of name:
Notable exposures at north end of Childs Mountain, Ajo quadrangle, Pima Co., southwestern AZ (Gilluly, 1937).
AAPG geologic province:
Basin-and-Range 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 ([ ]).