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Stromatolite images (stromatolith) - stock photos showing masses of bacteria among the oldest life forms on Earth

What is hard like a rock, is alive, and is among the oldest life forms on earth? A reasonable guess might be hard coral, but coral has only been in existence a mere 542 million years, or since the Cambrian Period. The answer is stromatolites, hard, rock-like structures that exist in places few forms of life can tolerate and that have been in existence for some 3.5...
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