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Monkey Mia Reserve, Western Australia, World Heritage Site, beach with Stromatolites or stromatoliths, formed in shallow water by the trapping, binding and cementation of sedimentary grains by biofilms of microorganisms, especially cyanobacteria (commonly known as blue-green algae).  Stromatolites provide some of the most ancient records of life on Earth by fossil remains which date from more than 3.5 billion years ago