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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 38 (1954)

Issue: 11. (November)

First Page: 2357

Last Page: 2371

Title: Corcoran Clay--A Pleistocene Lacustrine Deposit in San Joaquin Valley, California

Author(s): John W. Frink (2), Harry A. Kues (2)

Abstract:

The Corcoran clay represents a unique departure from the continental alluvial fan deposition of the Quaternary of the San Joaquin Valley. It is massive, silty clay, highly diatomaceous, 50-120 feet thick, generally 200-800 feet beneath the surface, extending over an area greater than 4,000 square miles.

The Corcoran clay is involved in a southward plunging, open syncline of which the west flank is the steeper. Present evidence limits the age between extreme upper Pliocene and mid-Pleistocene.

The lake in which it was deposited was probably formed by diastrophism in the Coast Range, by drowning of the San Joaquin Valley during a sea-level rise, or by construction of a fan by the Sacramento River and others east of Carqinez Strait, thereby damming the outlet of more southerly streams.

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