This is a very well preserved clam specimen preserved in its entirety. Most shell fossils are scattered about before becoming covered in sediment and are more likely to be found separated or broken.
Most of New Zealands fossil record is comprised of marine shells which were buried by sediment on the sea floor. From small filter-feeders like clam or mollusk to coral, sponges and micro-fossils.
Although very rare, fossils of even larger creatures such as Arthropods, Fish and Reptiles are also included in the Fossil record.