"TomHendricks474"  wrote in message 
news:cj4nbi$1t3u$1{at}darwin.ediacara.org...
>> But the consensus today is Earth's early
>>atmosphere was not a reducing atmosphere but one filled mainly with
>>carbon dioxide and nitrogen.
>
> Maybe not. I've reported a study that says there is not enough carbon 
> buried if
> the atmosphere was the CO2 that the new scenario suggests.
> So we may be back to the Miller experiment atmosphere.
>

It's still a good assumption. Most planets have reducing atmospheres, being 
formed that way when the star systems are formed.  It's hard to imagine how 
a planet can convert to an oxidizing atmosphere without the presence of 
organisms such as anaerobic bacteria.
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