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Open-File Report 00-319

Age and Paleoenvironmental Significance of Mega-Invertebrates from the "San Pedro" Formation in the Coyote Hills, Fullerton and Buena Park, Orange County, Southern California

By Charles L. Powell, II and Dave Stevens

Thumbnail of and link to report PDF (10 MB)Abstract

The "San Pedro" Formation in the Coyote Hills contains an invertebrate fossil as-semblage of 184 taxa from 158 localities. The fauna consists of two annelids, 174 mollusks (80 bivalves, 94 gastropods, and three scaphopods), five arthropods, and three echinoids, along with other minor constituents recognized by not specifically identified during the present study. These fossils are divided into three assemblages; 1) a lower, Pliocene assemblage (which may not differ ecologically from the middle fauna), 2) a middle, cool water assemblage, and 3) an upper, temperate to warm water. These fossils suggest a probably late Pliocene to early Pleistocene age for outcrops of the "San Pedro" Formation in the Coyote Hills. A fourth assemblage with a limited, restricted marine fauna occurs in the overlying Coyote Hills Formation. The occurrence of Solamen columbianum (Dall) (Mollusca: Bivalvia) in the "San Pedro" Formation of the Coyote Hills marks its first occurrence as a fossil. The oldest fossil occurrence of the gastropods Tegula pulligo (Gmelin), questionably Haliotis cracherodii Leach, and the crustacean Randallia ornata (Randell) occurs in the "San Pedro" Formation in the Coyote Hills.

First posted November 9, 2000

For additional information, contact:
Geology, Minerals, Energy, and Geophysics Science Center
U.S. Geological Survey
345 Middlefield Road, MS 901
Menlo Park, CA 94025-3591
http://geomaps.wr.usgs.gov/gmeg/

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Suggested citation:

Powell, II, Charles L., and Stevens, Dave, 2000, Age and Paleoenvironmental Significance of Mega-Invertebrates from the "San Pedro" Formation in the Coyote Hills, Fullerton and Buena Park, Orange County, Southern California: U.S. Geological Survey Open-File Report 00-319, 84 pp., https://pubs.usgs.gov/of/2000/0319/.



Contents

Abstract

Introduction

Stratigraphy of the “San Pedro” Formation

Previous paleontological studies of the “San Pedro” Formation in the Coyote Hills

Faunal composition and paleoecology

Age

Conclusions


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