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<p>[QUOTE=&quot;Sallent, post: 3113352, member: 76194&quot;]Funny you mentioned that, as I actually purchased a slab today of a stromarolite fossil from Australia. The reds on the slab are from periods where rich iron deposits were probably washed down into the shoreline where the bacterial mats were, and the iron rich sediments were trapped by the cianobacteria that forms stromatolites.</p><p><br /></p><p>If you look carefully, you can even see banding on the dark areas with dark mineral deposits.</p><p><br /></p><p>[ATTACH=full]790404[/ATTACH] [ATTACH=full]790405[/ATTACH]</p><p>SPECIES: Tiger Iron Stromatolite</p><p>AGE: Archean (~2.7 Billion Years)</p><p>LOCATION: Pilbara, Western Australia</p><p>SIZE: 4.2&quot;x 3.9&quot;, .4&quot; Thick</p><p><br /></p><p>I normally don&#039;t care for overpolished stuff, but with stromarolite fossils I was willing to make the exception. Namely because it is almost impossible to find one that wasn&#039;t polished, and unless I wanted to fly to Australia and apply for an exports permit, then go and try to find my own sample, this was basically my only choice. Plus it does look kinda nice, doesn&#039;t it?[/QUOTE]</p><p><br /></p>

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