- Usage in publication:
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- Bonita sandstone
- Modifications:
-
- [Areal extent]
- Dominant lithology:
-
- Sandstone
- AAPG geologic province:
-
- Santa Cruz basin
Arnold, R.A., 1902, The Pleistocene ecology of southern California [abs.]: Science, new series, Geological Society of America, Cordilleran Section, 3rd annual meeting, San Francisco, CA, December 30-31, 1901, v. 15, no. 376, p. 415-416.
Summary:
Table on p. 416 (Geological section of the Coast Ranges of California in the vicinity of the bay of San Francisco). Bonita sandstone. 1,400 feet thick, top formation of Franciscan. [Shown on table as overlying San Miguel cherts and unconformably underlying Knoxville. Age is Jurassic(?). See also A.C. Lawson, 1903, GSA Bull., v. 13, no. 1, table on p. 544-545.]
Source: US geologic names lexicon (USGS Bull. 896, p. 234-235).
- Usage in publication:
-
- Bonita sandstone*
- Modifications:
-
- [Principal reference]
- Dominant lithology:
-
- Sandstone
- AAPG geologic province:
-
- Santa Cruz basin
Summary:
Bonita sandstone of Franciscan group. Massive, obscurely bedded arkosic sandstone of dark greenish gray color and medium texture, with subordinate amounts of shale and conglomerate. Thickness about 1,400 feet. Top formation of Franciscan group. Conformably overlies Ingleside chert. [Age is Jurassic(?).]
Named from exposures at Point Bonita, on north shore of Golden Gate, Tamalpais 15-min quadrangle, Marin Co., San Francisco region, western CA.
Source: Publication; US geologic names lexicon (USGS Bull. 896, p. 234-235); GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
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- Bonita Sandstone†
- Bonita Sandstone Member†
- Modifications:
-
- Abandoned
- AAPG geologic province:
-
- Santa Cruz basin
Summary:
†Bonita Sandstone of Franciscan Group of Lawson (1914); later †Bonita Sandstone Member of Franciscan Formation. Abandoned because writer was unable to use beds as stratigraphic markers as suggested by Lawson. Age of Franciscan given as Jurassic and Cretaceous in part based on single ammonite DOUVILLEICERAS sp. (citing Schlocker and others, 1954).
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 ([ ]).