Shark Bay

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Stromatolites are formed in salt water by the trapping grains of micro-organisms and cementing them into a structures similar to stalagmites in a cave. They are of interest to biologists because they contain records of ancient life from the Precambrian age and even further back to the Archean age, when single-celled blue-green bacteria were cemented. Although they are rare today, Modern Stromatolites still exist in Shark Bay, Western Australia and a few other locations around the world.