Skip to Main Content
Book Chapter

Cenozoic Marine Mollusks and Paleogeography of the Gulf of California

By
Judith Terry Smith
Judith Terry Smith
Consulting Paleontologist Palo Alto, California, U.S.A.
Search for other works by this author on:
Published:
January 01, 1991

Abstract

Tertiary marine mollusks in sediments associated with radiometrically dated volcanic rocks provide improved resolution for correlating upper Oligocene to Pliocene sediments in the Gulf of California and its northern extension, the Salton Trough of California. The megafossils discussed in this report came from the following formations: San Gregorio Formation, El Cien Formation, Isidro Formation, Trinidad Formation, Salada Formation, San Ignacio Formation, Boleo Formation, San Marcos Formation, Tirabuzón Formation (= Gloria Formation of Wilson, 1948), Carmen Formation, Marquer Formation, Imperial Formation, Ferrotepec Formation, and unnamed deposits at San Felipe, Isla Tiburón, Rancho el Refugio, and the La Mira basin, Michoacan.

Paleoshorelines are identified by littoral mollusks whose faunal affinities are with the Tertiary Caribbean and Pacific-Panamic provinces. By the late middle Miocene (13 Ma), the sea extended to Isla Tiburón, Sonora, where it supported a distinctive molluscan fauna. Before the late Miocene (6 Ma), some of the same mollusks lived as far north as the Salton Trough, as seen from Imperial Formation megafossils at San Gorgonio Pass, California.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables

Contents

AAPG Memoir

The Gulf and Peninsular Province of the Californias

J. Paul Dauphin
J. Paul Dauphin
Search for other works by this author on:
Bernd R. T. Simoneit
Bernd R. T. Simoneit
Search for other works by this author on:
American Association of Petroleum Geologists
Volume
47
ISBN electronic:
9781629811130
Publication date:
January 01, 1991

GeoRef

References

Related

A comprehensive resource of eBooks for researchers in the Earth Sciences

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal