Geological Superstore


Bivalves are among the oldest hard fossils to be found to date, showing up in the early Cambrian more than 500 million years ago. It is believed that a permanent change in ocean or atmospheric chemistry made it possible for organisms to secrete chemicals to form hard shells of calcium carbonate, which in turn acted as a shelter of sorts for the organism inside as well as a defensive measure. Bivalves are among the most easily recognisable fossils found, and due to the number of species found and their general abundance are particularly good for use as zoning fossils and have thus become the main focal point of a variety of palaeontological studies and literature.

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