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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 2014.009.048
Description Annelida sp., worm colony 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 comprised of both worm colony fossilized remains (darker brown coloring) and castings (light gray coloring). Cylindrical and spherical shapes are easily identifiable on top surface. Underside surface appears to contain small shell fragments and a few worm fossils.
Object Name Shell, Animal
Collection 3D - Biology
Title Annelida sp., Worm Colony Fossil, 1.5-.75 Ma
Date 1.5 - .75 Ma
Kingdom Animalia (Animals)
Phylum Annelida (Segmented Worms)
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 4/8/2014.
Annelida sp. (Common name: Worm) still thrives in the Bay Area.
Dimensions H-2.25 W-3.5 D-3 inches
Search Terms Fossils
Merced Formation
South San Francisco
Subjects Fossils
Marine biology