Usage:
Nelson Mountain Tuff (CO*)
Geologic age:
early Tertiary (late Oligocene; Chattian)*
Type section, locality, area and/or origin of name:
Named for fact it is cap rock on Nelson Mountain, [in SW/4 sec. 1, T. 42 N., R. 1 W., Lat. 37 deg. 54 min. 57 sec. N., Long. 106 deg. 56 min. 14 sec. W., San Luis Peak 7.5-min quadrangle], Creede district, Mineral Co., southwestern CO (Emmons and Larsen, 1923).
AAPG geologic province:
San Juan Mountains province*
San Luis 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 ([ ]).