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Geologic Unit: Atlas
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Map showing publication footprint
  • Usage in publication:
    • Atlas formation
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Alluvium
  • AAPG geologic province:
    • San Joaquin basin
Publication:

Lawson, A.C., 1906, The geomorphology of the Tehachapi Valley system [California]: University of California Publications in Geological Sciences, v. 4, p. 431-462., See also GSA Bull., v. 17, p. 729, 1907 [abs.]


Summary:

Pg. 431-462. Atlas formation. Ancient alluvium, made up of angular fragments of rocks of bed-rock complex, including schists, quartz diorite, granite, quartz, and arkose, well cemented. Older than Tank volcanics. Age is Quaternary(?).
[Origin of name not stated and not known. Occurs in Kern Co., southern CA.]

Source: US geologic names lexicon (USGS Bull. 896, p. 88).


Map showing publication footprint
  • Usage in publication:
    • Atlas formation
  • Modifications:
    • Overview
  • AAPG geologic province:
    • San Joaquin basin
Publication:

Jenkins, O.P., 1943, Glossary of the geologic units of California, IN Jenkins, O.P., and others, Geologic formations and economic development of the oil and gas fields of California; in four parts, including outline geologic map showing oil and gas fields and drilled areas: California Division of Mines Bulletin, no. 118, pt. 4, p. 666-687.


Summary:

Atlas formation. [Age is] Quaternary. Older than Tank volcanics.

Source: US geologic names lexicon (USGS Bull. 1200, p. 165).


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 ([ ]).

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