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The mission of the San Mateo County Historical Association is to inspire wonder and discovery
of the cultural and natural history of San Mateo County.

Object Record

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Catalog Number 2014.009.015
Description Nassarius? sp., top snail 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 embedded in sediment, with only the top swirl visible. Specimen is multi-colored in white, red and various shades of brown. Red indicates the likely presence of iron oxide. Underside surface has what appears to be white shell fragments, resembling white threads embedded in sediment.
Object Name Shell, Animal
Collection 3D - Paleontology
Title Nassarius? sp., Top Snail Fossil, 1.5-.75 Ma
Date 1.5 - .75 Ma
Kingdom Animalia (Animals)
Phylum Mollusca (Molluscs)
Class Gastropoda (Snails, limpets)
Family Nassariidae (Mud Snails)
Genus Nassarius?
Species sp.
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.
Dimensions H-1 W-1.75 D-1.25 inches
Search Terms Fossils
Shellfish
Merced Formation
South San Francisco
Subjects Fossils
Shells
Shellfish
Snails
Marine biology