Usage:
Treasure Mountain Group (CO*)
Treasure Mountain Tuff (CO*,NM*)
Treasure Mountain Rhyolite (NM)
Subunits:
GROUP STATUS (alphabetical) --all in CO*: Black Mountain Tuff, Chiquito Peak Tuff, La Jara Canyon Tuff, Ojito Creek Tuff, Ra Jadero Tuff, South Fork Tuff.
FORMATION STATUS (alphabetical) --all in NM: Lagunitas Clastic Member, Osier Mountain Welded Tuff Member, Toltec Andesite Member.
Geologic age:
early Tertiary (early Oligocene; Rupelian)*
Type section, locality, area and/or origin of name:
Named from exposures on Treasure Mountain, in northwest part of Summitville quadrangle, Conejos Co., southern CO (Emmons and Larsen, 1923).
AAPG geologic province:
San Juan basin*
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 ([ ]).