>>If reducing atmosphere was true back 2 billion years ago, you would expect to find some evidence of that in our geological layers. But you don't. Instead you see abundance of oxydized medals like Magnetite (Fe3O4) and hematite (Fe2O3) in the "Banded iron Formation" (common in Archean and Proterozoic strata). Other oxydized mineral like barite (BaSO4), celestite (SrSO4), anhydrite (CaSO4), and gypsum (CaSO42H2O) are also common at this layer.
>
>It may as well be proof that the atmosphere was anoxic, simply because all available oxygen was bound in such compounds. And then, is such anoxic atmosphere necessarily reducing? Though, chemistry is one of the sciences where my knowledge is thin (it extended to doing my developers and fixers by recipe, not buying ready mixes for my photo lab, but not much further).
Recently scientists from NASA put out a theory on why they believe early atmosphere, about 2 billion years ago, had abundant amount of free oxygen. They said it was mainly due to rapid loss of hydrogen to the exposed outer spacee. However, they also say before this occured, there were "simple" cells already on earth. This point has been one of the arguement that many scientists have offered, but was largely ignored by the main stream science community, according to the article.
http://www.andweb.demon.co.uk/environment/oxygen.html.
http://www.freerepublic.com/forum/a3aa6b38a607a.htmhttp://www.arn.org/docs/odesign/od171/rnaworld171.htm
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