Usage:
Macho Andesite (NM-recognized locally in Macho mining district)
Geologic age:
early Tertiary (Eocene)
Type section, locality, area and/or origin of name:
Named from Macho mining district, in W/2 sec. 20, T. 19 S., R. 7 W., [approx. Lat. 32 deg. 38 min. 18 sec. N., Long. 107 deg. 35 min. 12 sec. W., Lake Valley 7.5-min quadrangle], Sierra Co., southwestern NM (Jicha, 1954).
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 ([ ]).