- Usage in publication:
-
- Sunflower Mountain Tuff*
- Modifications:
-
- Named
- Geochronologic dating
- Dominant lithology:
-
- Tuff
- Volcanics
- AAPG geologic province:
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- Great Basin province
Summary:
Sunflower Mountain Tuff named for Sunflower Mountain in the Sunflower Mtn. 7.5' quad, Lincoln Co, NV. Type section is designated as exposures of both upper and lower members of the formation that are exposed about 7.3 km northeast of Sunflower Mountain and 2.0 km northeast of Grapevine Spring in the Vigo NW 7.5' quad where it extends from lat. 37deg08.38'N, long. 114deg41.51'W up a cliff to lat. 37deg08.31'N, long. 114deg41.35'W. Consists of rhyolite ash-flow tuff comprising a compound cooling unit containing an upper, more-welded zone and a lower, less-welded zone. Thickness is about 200 m at type; elsewhere ranges from 100 to 190 m. Conformably overlies the Delamar Lake Tuff (new); conformably underlies the Grapevine Spring Member (new) of the Kane Wash Tuff (revised). Age is Miocene based on K-Ar (sanidine) age of 14.7 +/-0.4 Ma.
Source: GNU records (USGS DDS-6; Menlo 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 ([ ]).