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<p>[QUOTE=&quot;Numisnewbiest, post: 8292623, member: 99613&quot;]By far, my oldest artifact is this 11.9&quot; stromatolite slab from western Australia, at 3.02 billion years old. It was hard to get a good picture because it&#039;s polished as smooth as glass, so it&#039;s very reflective.</p><p><br /></p><p>Stromatolites typically formed in shallow water by the growth of layer upon layer of cyanobacteria, a single-celled, photosynthesizing microbe. These oxygen-producing cyanobacteria were responsible for possibly the largest changes the earth has undergone. They were the only major source of atmospheric oxygen, critical for the development of more complex life.</p><p><br /></p><p>Stromatolites are some of the oldest records of life on this planet.</p><p><br /></p><p>[ATTACH=full]1466084[/ATTACH][/QUOTE]</p><p><br /></p>

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