- Usage in publication:
-
- Deadwood Gulch rhyolite tuff*
- Modifications:
-
- Original reference
- AAPG geologic province:
-
- Basin-and-Range province
Summary:
Deadwood Gulch rhyolite tuff. White banded rhyolite, in small fragments, in an exceedingly fine-grained siliceous matrix. Thickness 10 to 400 feet. Older than Mogollon andesite and younger than Last Chance andesite. Age is Tertiary.
Named from exposures in upper part of Deadwood Gulch, Mogollon district, NM.
Source: US geologic names lexicon (USGS Bull. 896, p. 578).
- Usage in publication:
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- Deadwood Gulch Member*
- Modifications:
-
- Principal reference
- Age modified
- AAPG geologic province:
-
- Basin-and-Range province
Summary:
Is a member of Fanney Rhyolite. Type section designated as in sec 3, T1S, R19W, Catron Co, NM, Basin-and-Range province. Age changed from Miocene to Oligocene. Is the pyroclastic facies of the Fanney. Consists predominately of crudely layered pumiceous tuff breccia and partially welded ash-flow tuff, 0-200 m thick.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Deadwood Gulch Member*
- Modifications:
-
- Geochronologic dating
- AAPG geologic province:
-
- Basin-and-Range province
Summary:
As a member of Fanney Rhyolite has a 24.4 +/-1.5 m.y. (sanidine) age, [or Oligocene] in Grouse Mountain quad, Catron Co, NM, Basin-and-Range province.
Source: GNU records (USGS DDS-6; Denver GNULEX).
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 ([ ]).