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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 19 (1935)

Issue: 8. (August)

First Page: 1192

Last Page: 1204

Title: Oligocene Tumey Formation of California

Author(s): E. R. Atwill (2)

Abstract:

In the Cantua-Panoche Creeks district, which is about 25 miles north of Coalinga, Fresno County, the writer discovered a diagnostic assemblage of Oligocene fossils in a sandstone previously assigned to the Vaqueros of Lower Miocene age.

Conformably overlying this sandstone and associated with it to comprise the Tumey formation is a somewhat diatomaceous shale which is locally rich in Foraminifera. The writer studied these Foraminifera, compared them with those collected in shales of known Eocene and Oligocene age, and herein points out what he believes to be a present erroneous identification of a common species in the Oligocene.

Possible regional correlations of the Tumey formation are made, and reasons are given for segregating under a new name this sandstone and shale sequence which is a cartographic unit for at least 7 miles in the district examined, and which reaches a thickness of about 1,600 feet in maximum exposure.

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