- Usage in publication:
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- Brawley formation
- Modifications:
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- Original reference
- Dominant lithology:
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- Claystone
- Sandstone
- AAPG geologic province:
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- Salton basin
Summary:
Pg. 23 (fig. 2), 24, 25, pl. 2. Brawley formation. Defined as the lacustrine and continental basinward facies of Ocotillo conglomerate (new) ; at type section about 2,000 feet of light-gray claystone and thin interbeds of buff sandstone are exposed; in Superstition Hills, composed of lacustrine and terrestrial clays, sands, and pebble gravels, and base is not exposed. Around Superstition Mountain, Brawley formation, basal part of which is Ocotillo conglomerate facies, unconformably overlaps Imperial formation, Alverson lava (new), and Split Mountain formation onto diorite; southeastward and adjacent to Superstition Mountain fault, Ocotillo-Brawley series lies unconformably on Borrego clays, and an angular discordance of as much as 60 degrees is exposed north of fault.
Type section: west of U.S. Highway 99 and west of the south end of the Salton Sea, Imperial Co., southeastern CA.
Source: US geologic names lexicon (USGS Bull. 1200, p. 459).
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 ([ ]).