- Usage in publication:
-
- Red Buttes quartz basalt*
- Modifications:
-
- Named
- Dominant lithology:
-
- Basalt
- Andesite
- AAPG geologic province:
-
- Mojave basin
Summary:
Named as unit in Tropico group for Red Buttes, type locality, sec.5 T8N R6W, Kramer 15' quad, San Bernardino Co, CA. Prominently exposed north and northeast about 7 mi in Kramer Hills and Barstow 30' quad. Mapped as black quartz andesite by Bowen (1954) in eastern Kramer Hills. Is black basalt or mafic andesite consisting of several flows totaling about 360 ft thick. At Red Buttes overlies quartz monzonite; in Kramer Hills overlies (unconformably?) lower part of Tropico group. Unconformably underlies fanglomerate of probable Pleistocene(?) age. Is probably Pliocene(?) age based on stratigraphic position and correlation.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Red Buttes Quartz Basalt*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Mojave basin
Summary:
Red Buttes Quartz Basalt of Tropico Group now considered to be early Miocene(?) age based on correlation with Saddleback Basalt of Tropico Group.
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 ([ ]).