|Description||Macoma nasuta, bent-nosed clam 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 white clams with blue-gray growth rings and other shell fragments embedded in grayish sandy soil. Clam shells are cracked and have striations running across their surfaces. These striations likely resulted from tectonic movement along the juniper Serra Fault. Underside surface is predominantly shell fragments embedded throughout.|
|Object Name||Shell, Animal|
|Collection||3D - Paleontology|
|Title||Macoma nasuta, Bent-nosed Clam Fossil, 1.5-.75 Ma|
|Date||1.5 - .75 Ma|
|Order||Veneroida (bivalve order)|
|Family||Tellinidae (Bivalve molluscs)|
|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 4/8/2014.
Macoma nasuta (Common name: Bent Nose Clam) still thrives in the Bay Area.
|Dimensions||H-1.25 W-6 D-5 inches|
South San Francisco