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National Geologic Map Database

Geologic Unit: Treasure Mountain

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).