The rocks in the hyper-saline waters of Lake Thetis, about 120 km north of Perth in Western Australia, are not quite what they seem. They are actually living things. Stromatolites are the oldest living life-forms on our planet.


They are formed through the activity of primitive unicellular organisms: cyanobacteria (blue-green algae) and other algae. These grow through sediment and sand, binding the sedimentary particles together, resulting in successive layers which, over a long period of time,...
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