|Description||Lucinoma annulata, ringed lucine 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 of a top shell embedded in sediment. Shell is somewhat flat and nearly symmetrical. Growth lines are visible from underneath sediment coating the shell. Rosy-colored hue is likely from iron oxide present. Underside surface is dark brown, with reddish patches throughout.|
|Object Name||Shell, Animal|
|Collection||3D - Paleontology|
|Title||Lucinoma annulata, Ringed Lucine Fossil, 1.5-.75 Ma|
|Date||1.5 - .75 Ma|
|Order||Veneroida (bivalve order)|
|Family||Lucinidae (Saltwater clams)|
|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.|
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-1.375 W-2.125 D-1.875 inches|
South San Francisco