TONY CAMACHO / SCIENCE PHOTO LIBRARY TONY CAMACHO / SCIENCE PHOTO LIBRARY
Fossil clams. Clams are a type of bivalve (two- shelled) mollusc. An entire fossil is seen at right, with the impression of another larger fossil at left. A fossil is created when an animal is quickly buried in sand, mud or volcanic ash after death, and the normal decay processes do not occur. The minerals of the hard parts of the animal, in this case the shell, are gradually replaced with rock. This fossil was found at Touwsriver in the Western Cape of South Africa.
Model release not required. Property release not required.