Thrombolites, some of the oldest living organisms on earth, growing on the shores of Lake Clifton, near Mandura south of Perth in Western Australia

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Photo credit: © Stephen Dwyer / Alamy / Afripics
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Keywords: 2012, april, aust, australia, australian, bacteria, coast, horizontal, living, micro, organisms, rock-, single-celled, structures, thrombolites, west, western