- Usage in publication:
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- Brougher dacite*
- Modifications:
-
- Named
- Dominant lithology:
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- Dacite
- AAPG geologic province:
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- Great Basin province
Summary:
Brougher dacite is recognized in Butler, Brougher, Siebert, and Golden mountains, Tonopah mining district, [Tonopah 7.5' quad, Nye and Esmeralda Cos, NV]. [Is probably named for Brougher Mountain, sec.2 T2N R24E, Tonopah 7.5' quad, Esmeralda Co, NV.] Intrudes earlier andesite, Fraction dacite breccia, Tonopah rhyolite dacite, Siebert tuff, and overlying basalt. Unit is brown porphyritic dacite; contains basalt inclusions in several places; flow structures present. Is apparently of about same age as Oddie rhyolite and of same nature and origin. Age is Tertiary.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Brougher Dacite*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Great Basin province
Summary:
Brougher Dacite. Age is modified based on K-Ar age of 16.2 +/-0.4 Ma (biotite) [old constant]. Age is Miocene.
Source: Modified from GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
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- Brougher Rhyolite*
- Modifications:
-
- Redescribed
- Geochronologic dating
- AAPG geologic province:
-
- Great Basin province
Summary:
Brougher Rhyolite. Redescribed from Brougher Dacite [adopts redescription of unit by Bonham and Garside (1979)]. Age is Miocene, based on K-Ar age of 16.5 +/-0.5 Ma to 13.2 +/-0.4 Ma.
Source: Modified from 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 ([ ]).