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Interesting. The oldest life known is actually Stomatolites though, structures of cyanobacteria as opposed to sediment as with the Apex Chert. Apex chert has biomarkers for life only. Big difference. We have biomarkers on martian meteorites such as in ALH84001 but that doesn't prove life (to most).
Anyway I have the actual paper if anyone is interested (it's a 1.1meg PDF...Mods?) Note they still say it's consistent with life....Isotope ratios of C13 still indicate life.
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