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Re: Primordial Air Mau Have Been Breathable
> The researchers' theory has been lent additional weight by evidence from
> the Western Australian Pilbara region for the presence of sulphates in
> rocks up to 3.5 billion years old. These, too, could not have formed
> without an oxygen-rich atmosphere.
Sure? There are plently of sulphur-eating bacteria and AFAIK archaea; I
don't know if they all need lots of oxygen, maybe just living under a
cyanobacterial biomat is enough, maybe nitrate rather than elementary oxygen
is enough... I think I can look that up next week.