2.5 billion-year-old traces of life locked inside primeval ruby

Feb 19, 2020
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Similar carbon isotopic evidence has been reported from among the oldest rocks on Earth. Along with fossil stromatolites, free-living algae, rare-earth evidence and oxidized iron (hematite) , It confirms that free oxygen was being emitted as early as 3.5 Byr-ago. There is no reason to doubt this anymore just to support a GOE theory.
 

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