Object Record
Images



Metadata
Title |
Lucinoma annulata, Ringed Lucine Fossil, 1.5-.75 Ma |
Object Name |
Shell, Animal |
Description |
Dosinia sp., fossil, probably from the Miocene and dating from between 23.03 to 5.333 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 of the top shell only with underlying sediment. Dark brown in hue, with some reddish patches, likely indicating the presence of iron oxide. White shell fragments are also visible on the top surface. Underside surface features worm castings in sediment. |
Date |
23.03-5.333 Ma |
Catalog Number |
2014.009.024 |
Collection |
3D - Biology |
Kingdom |
Animalia (Animals) |
Phylum |
Mollusca (Molluscs) |
Class |
Bivalvia (Bivalves) |
Order |
Veneroida (bivalve order) |
Family |
Veneridae (Butterclam) |
Genus |
Dosinia |
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 |
USGS Emeritus Charles Powell identified on 04/17/2018. Retired Geologist Ken Lajoie identified on 4/24/2014. Lucinoma annulata (Common name: Ringed Lucine) are nearly symmetrically round, with a point in the center. Shells feature ridged rings, which are added annually. This species still thrives in the Bay Area. |
Dimensions |
H-1.125 W-2.125 D-2 inches |
Search Terms |
Fossils Merced Formation Shellfish South San Francisco |
Subjects |
Fossils Marine biology Shellfish Shells Worms |
Credit line |
Courtesy of Marilyn & Robert Moore |