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National Geologic Map Database

Geologic Unit: Silverton

Usage:

Silverton Volcanics (CO*)


Subunits:

(alphabetical) --all in CO*: Burns Member, Henson Member.


Geologic age:

early Tertiary (Oligocene)*


Type section, locality, area and/or origin of name:

Named after Silverton 15-min quadrangle, where units have their greatest development, [Ouray, San Juan, and Hinsdale Cos.], southwestern CO (US geologic names lexicon, USGS Bull. 1200).


AAPG geologic province:

Paradox basin*
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 ([ ]).