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GEOREF RECORD

Subdivision of San Lorenzo Formation (Eocene-Oligocene), west-central California

Earl E. Brabb
Subdivision of San Lorenzo Formation (Eocene-Oligocene), west-central California
Bulletin of the American Association of Petroleum Geologists (1964) 48 (5): 670-679

Abstract

This formation, long considered synonymous with Oligocene Series, was never adequately studied in its type area, resulting in falacious concepts of its faunas and correlations. The name was extended to rocks as far north as British Columbia and as far south as southern California. Subdivided, the older Twobar Shale Member appears to have been deposited slowly in a bathyal open-sea environment, the younger Rices Mudstone Member rapidly in a restricted basin. Most of the so-called characteristic mollusks are from the Rices Mudstone Member of overlying Vaqueros Sandstone. Subdivision of the San Lorenzo Formation and discovery of glauconitic marker beds provide additional stratigraphic control in an oil province with poor exposures.


ISSN: 0883-9247
Serial Title: Bulletin of the American Association of Petroleum Geologists
Serial Volume: 48
Serial Issue: 5
Title: Subdivision of San Lorenzo Formation (Eocene-Oligocene), west-central California
Author(s): Brabb, Earl E.
Pages: 670-679
Published: 1964
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Accession Number: 1964-013404
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N32°30'00" - N42°00'00", W124°30'00" - W114°15'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1964
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