|Description||Cardium sp.,cockle (clam) fossil, 1.5-.75 Ma 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 has a fully preserved top and bottom shell, still connected by the ligament. Both shells are concave in shape. A fracture runs down the middle of the top shell. Area closest to the ligament is white; the remaining area is multicolored in varying shades of brown, beige and reddish brown (likely indicating the presence of iron oxide). Growth lines are easily visible. The bottom shell has a fracture that runs diagonally across the shell. Shell is multi-colored in shades of white, beige and reddish brown. Growth lines are easily visible.|
|Object Name||Shell, Animal|
|Collection||3D - Paleontology|
|Title||Cardium sp.,Cockle (clam) Fossil, 1.5-.75 Ma|
|Date||1.5 - .75 Ma|
|Order||Veneroida (bivalve order)|
|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.
Cardium sp. (Common Name: Cockle Shell) still thrives in the Bay Area.
|Dimensions||H-1.375 W-2 D-1.875 inches|
South San Francisco