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The mission of the San Mateo County Historical Association is to inspire wonder and discovery
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Object Record

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Catalog Number 2014.009.012
Description Clinocardium nuttalli, basket cockle fossil dating from between 1.5 million years ago to .75 million years ago commonly found at low tide in littoral (sandy and muddy bottom) or sub-littoral (open bay, muddy marine) zones. Fossil specimen is scalloped-shaped, pinkish in hue and is rounded at the top. Light brown sediment fills the spaces between ridges that run the length of the shell. Underside surface has large fragment of another species of clam, also pinkish in hue. This clamshell is flatter, with growth rings. Underlying light brown sediment is exposed, embedded with smaller fragments of shell.
Object Name Shell, Animal
Collection 3D - Paleontology
Title Clinocardium nuttalli, Basket Cockle Fossil, 1.5-.75 Ma
Date 1.5 - .75 Ma
Kingdom Animalia (Animals)
Phylum Mollusca (Molluscs)
Class Bivalvia (Bivalves)
Order Veneroida (bivalve order)
Family Cardiidae (Cockles)
Genus Clinocardium
Species nuttalli
Inscription Text none
Provenance Fossils taken from Merced Formation collected at Westborough Boulevard at Highway 280 in the late 1970s or early 1980s. (See Yancey 1978, Fig. 2: Artifacts taken from E Stratified Section/D-5929). Most specimens (especially clams) in this collection are not extinct and can still be found in the Bay Area.
Notes Retired Geologist Ken Lajoie identified on 4/24/2014.
Clinocardium nuttali (Common name: Basket Cockle) still thrives in the Bay Area.
Dimensions H-0.75 W-1.75 D-1.5 inches
Search Terms Fossils
Shellfish
Merced Formation
South San Francisco
Subjects Fossils
Shells
Shellfish
Marine biology