Open-File Report 00-319
AbstractThe "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: Part or all of this report is presented in Portable Document Format (PDF). For best results viewing and printing PDF documents, it is recommended that you download the documents to your computer and open them with Adobe Reader. PDF documents opened from your browser may not display or print as intended. Download the latest version of Adobe Reader, free of charge. |
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/.
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