Usage:
No current usage.
(†Equity Member of Nelson Mountain Tuff (CO*) considered abandoned. Rocks reallocated to unnamed welded dacite in Nelson Mountain Tuff. See Nelson Mountain.)
Geologic age:
early Tertiary (late Oligocene; Chattian)
Type section, locality, area and/or origin of name:
Named from development near Equity Mine, Creede district, southwestern CO (Emmons and Larsen, 1923).
[Equity Mine in secs. 34 and 35, T. 43 N., R. 1 W., Lat. 37 deg. 56 min. 12 sec. N., Long. 106 deg. 57 min. 34 sec. W., San Luis Peak 7.5-min quadrangle, Mineral Co., southwestern CO.]
AAPG geologic province:
San Juan Mountains 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 ([ ]).