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Re: extinction by suffocation?!
There is a really good article on this subject in J. Exp. Biol. 201,1043-1050
Atmospheric Oxygen, Giant Paleozoic Insects And The Evolution Of Aerial
Performance by Robert Dudley.
Dudley reports that oxygen peaked at 35% at the very end of the Carboniferous
declined precipitously into and through the Permian, with a double minimum in
Jurassic and early Triassic, then rose to another, lower maximum at the end of
Cretaceous and early Tertiary, before declining gradually to the present day
It's interesting to note that spontaneous combustion of the biosphere might be
at 35% oxygen concentration. Wonder where all those coal deposits came from?
higher oxygen partial pressures might allow oxygen and carbon dioxide exchange
trachea of long-necked animals. Both thoughts are highly speculative. Take
them with a
grain of salt, if at all.
Richard W Travsky wrote:
> On Tue, 22 Dec 1998 Ccookk@aol.com wrote:
> > I just happened to see a partial of what you are talking about.
> > Evidently
> > some gas trapped in amber was analyzed to be approximately 35% oxygen. This
> > was from the time of the dino's, Jurassic I beleive. So the theory goes that
> I saw most of this, and I'm pretty sure they said cretaceous. (Oh dear...)
> > [...]
> > I can see how some of this may be viable as a concept, but really
> > need to get
> > more info on this. One thing is may explain, is how the large sauropods were
> > able to get enought oxygen through those large necks. A greater percent of
> I've been curious whether or not any absorption through the skin was
> possible (I doubt it, tho).
> > [...]