It's now acknowledged that the early atmosphere was rich in oxygen. New Evidence of Early Atmosphere and Life, Bulletin of the American Meteorological Society, Vol. 63:1328-1330 (Nov. 1982).
” New Evidence of Early Atmosphere and Life, Bulletin of the American Meteorological Society, Vol. 63:1328-1330 (Nov. 1982).”
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http://journals.ametsoc.org/toc/bams/63/11