Stromatolites

thumb|Fossilized stromatolite in Strelley Pool [[chert, about 3.4 billion years old, from Pilbara Craton, Western Australia]] thumb|Modern stromatolites in Shark Bay, Western Australia|Shark Bay, Western Australia

thumb|right|Microbialites in Lake Salda rocks thumb|Emerged microbialite formation at Lake Van, East Anatolia alt=|thumb|right|Classification of microbialites (redrawn and simplified from Schmid, 1996).alt=|thumb|right|Stromatolites – laminated microbialites (Precambrian silicified stromatolite, Strelley Pool Chert, (Pilbara Craton), Western Australia|W. Australia)

lake in Argentina