Stromatolites are one of the most ancient form of life on Earth, here seen in Lake Thetis in Western Australia

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Photo credit: © Antonio Ribeiro / Alamy / Afripics
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Keywords: algae, ancient, boulders, dome, form, fossil, geological, heritage, lake, life, marine, organo, paleontology, prehistoric, rock, sedimentary, stromatolites, stromotolites, structure, thetis, type