3,5 mil milhões de anos (início da vida na terra?):
http://www.mirror.co.uk/science/scientists-find-oldest-fossils-ever-11718073
Citando:
"Prof Valley's team was able to tease apart the carbon-12 from the carbon-13 within each fossil and measure the ratio of the two compared to a known carbon isotope standard and a fossil-less section of the rock in which they were found.
He said: "The differences in carbon isotope ratios correlate with their shapes.
"If they're not biological there is no reason for such a correlation. Their C-13-to-C-12 ratios are characteristic of biology and metabolic function," Prof Valley, said, based on this information, the researchers were also able to assign identities and likely physiological behaviours to the fossils locked inside the rock."
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