"William Morse"  wrote in message
news:cjasmd$m1h$1{at}darwin.ediacara.org...
> joe{at}removethispart.gs.washington.edu (Joe Felsenstein) wrote in
> news:cj9cfv$6ve$1{at}darwin.ediacara.org:
> > In article ,
> > Brett Aubrey   wrote:
> >>My notes suggest that the earliest photosynthesis was around
> >>~3.1 BYA, which concurrently began to create an oxidized
> >>atmosphere.  This in turn started the extinction of anaerobes
> >>and the rise of aerobic organisms.
> >>If these notes are relatively accurate, do we have an ballpark idea of
> >>the length of time it took for the extinction of anaerobic organisms?
> >>(e.g. tens or hundreds of millions of years?)  Regards,  Brett Aubrey.
> > It seems to be taking forever.  That extinction is still not complete.
> >  As I sit here my gut is loaded with an anaerobic bacterium
> > (Bacteroides), for example.  So is yours.
> OK, so Brett didn't know how to properly phrase the question. But do you
> know if there is any good information on just how quickly environments
> changed from low to high redox potential, and how quickly populations
> changed from predominantly obligate anaerobes to a mix of aerobic,
> facultative, and anaerobic forms?
>
> Yours,
>
> Bill Morse

Thanks for the vote of confidence, Bill.  But it's (sigh!) worse than that
:-( .  I had thought extinction of anaerobes meant just that and formed my
question based on this misunderstanding, and thus learned something from the
responses (yours too).  I don't mind getting dinged by sarcasm, as long as I
learn.  Regards, Brett.
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