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90 & Contributions in Science, Number 520 Squires: Pico Formation Paleontology

Miltha xantusi (Dall, 1905) and Dosinia ponderosa (Gray, 1838) Bandel, K. 1976. Observations on spawn, embryonic development and
live in the southern (tropical) part of the Gulf of California, as ecology of some Caribbean lower Mesogastropda (Mollusca). The
well as much farther south (see Table 2 for references). Veliger 18(3):249–271.
Two of the extinct mollusks from the Newhall area are warm- Barrows, A.G., J.E. Kahle, R.B. Saul, and F.H. Weber, Jr. 1975. Geologic
map of the San Fernando Earthquake area. In San Fernando,
water indicators found only in fossil deposits of Southern California, earthquake of 9 February 1971, ed. G.B. Oakeshott, pl.
California and Baja California, Mexico. They are Argopecten 2 5 map (in envelope), 1 sheet, scale 1:18,000. Sacramento:
invalidus and Lyropecten catalinae (Arnold, 1906) [5 Lyropec- California Division of Mines and Geology Bulletin 196.
ten gallegosi (Jordan and Hertlein, 1926)]. Both are known Berry, L.A., T.H. McCulloh, R.E. Denison, R.W. Morin, R.J. Enrico, J.A.
(Minch et al., 1976) from as far south as the Pliocene Almejas Barron, and R.J. Fleck. 2009. Post-Miocene right separation on the
Formation just south of Bahia Tortugas on the Vizcaino San Gabriel and Vasquez Creek faults, with supporting chrono-
stratigraphy, western San Gabriel Mountains, California. United
Peninsula, Baja California Sur, Mexico. States Geological Survey Professional Paper 1759:1–44.
Another pectinid, Patinopecten healeyi (Arnold, 1906) which Berry, S.S. 1940. New Mollusca from the Pleistocene of San Pedro,
is present at most of the localities in the study area, is also California–I. Bulletins of American Paleontology 25(94A):149–164.
significant in the interpretation of Neogene zoogeography. This Boury, E.A.De. 1912–1913. Description de Scalidae nouveaux ou peu
species, like Lyropecten catalinae, is a giant pectinid (see connus. Journal de Conchyliologie 60(2):87–107.
Addicott, 1974), because of having a size commonly greater Broderip, W.J., and G.B. Sowerby. 1829. Observations on new or
than 90 mm. Patinopecten healeyi has an early to late Pliocene interesting Mollusca contained, for the most part, in the Museum of
the Zoological Society. The Zoological Journal 4:359–379.
chronologic range (e.g., Addicott, 1974; Moore, 1979). It Carpenter, P.P. 1857. Report on the present state of our knowledge with
reached its northernmost occurrence (Cape Mendocino in regard to the Mollusca of the West Coast of North America. British
northern California), but during the late Pliocene, the species Association for the Advancement of Science, Report 26(for
ranged farther south, with its southernmost occurrence in the 1856):159–368.
Almejas Formation in Baja California Sur (Moore, 1979:fig. 1)), ———. 1864. Supplementary report on the present state of our
along with the warm-water species Argopecten invalidus and L. knowledge with regard to the Mollusca of the West Coast of North
catalinae. America. British Association for the Advancement of Science,
The extinct epitoniid gastropod Amaea (Scalina) edwilsoni Report 33(for 1863):517–686.
DuShane, 1977, tentatively identified from the Newhall area, has ———. 1865. Diagnoses specierum et varietatum novarum moluscorum,
prope sinum pegetianum a Kennerlio, nuper decesso, collectorum.
been reported (DuShane, 1977) only from the Pliocene Tirabuzon Proceedings of the Academy of Natural Sciences of Philadelphia
Formation [formerly Gloria Formation] (Wilson, 1955) near 17:54–64.
Santa Rosalia on the Gulf of California, Baja Sur, Mexico. Carson, C.M. 1926. New molluscan species from the Californian
Pliocene. Bulletin of the Southern California Academy of Sciences
ACKNOWLEDGMENTS 25(2):49–62.
Chen, X. 1988. Depositional environments and paleogeography of the
This study would have been greatly diminished in its scope without the lower Saugus Formation, northern San Fernando Valley, Los
permission granted to me by the various land owners for access to their Angeles County, California. unpublished M.S. thesis. Northridge:
property west of California State Highway 14. James H. McLean (LACM California State University, Northridge, 79 pp.
Malacology) shared his knowledge of vetigastropods, muricids, and Clark, B.L. 1915. Fauna of the San Pablo Group of middle California.
turrids. Lindsey T. Groves (LACM Malacology) provided access to University of California Publications, Bulletin of the Department of
Geology 8(22):385–572.
difficult-to-find literature and shared his knowledge of Pliocene mollusks. ———. 1921. The marine Tertiary of the West Coast of the United States:
Brian J. Swanson, Pamela J. Irvine, and Jerome Treiman (all associated Its sequence, paleogeography, and the problems of correlation. The
with the California Geological Survey, Los Angeles), shared their Journal of Geology 29(7):583–614.
knowledge of the Saugus Formation. Charles L. Powell, II (USGS, Menlo Coan, E.V., P.V. Scott, and F.R. Bernard. 2000. Bivalve seashells of
Park) shared his knowledge of the fossils from Gold Creek in Big Tujunga western North America. Marine bivalve mollusks from Arctic
Canyon. The manuscript benefited considerably from critical reviews by Alaska to Baja California. Santa Barbara Museum of Natural
L.T. Groves and C.L. Powell II.
History Monographs Number 2. Studies in Biodiversity Number 2,
764 pp.
Coan, E.V., and P. Valentich-Scott. 2012. Bivalve seashells of tropical
west America. Marine bivalve mollusks from Baja California to
LITERATURE CITED northern Peru´. Santa Barbara Museum of Natural History Mono-
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Pliocene and Pleistocene of San Pedro, California. Memoirs of the ———. 1856. Descriptions of three new genera, twenty-three new species
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