Oxygen may have filled Earth's atmosphere hundreds of millions of years earlier than previously thought.
via Discovery News http://news.discovery.com/earth/rocks-fossils/earth-had-oxygen-earlier-130926.htm#mkcpgn=rssnws1
via Discovery News http://news.discovery.com/earth/rocks-fossils/earth-had-oxygen-earlier-130926.htm#mkcpgn=rssnws1
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