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Re: Theories on the extinction of dinosaurs
> > Seosamh wrote:
> >> The combined effects
> > > of these two on the atmosphere change its chemistry to something
> > > higher in oxygen.
> Since .... (......., increased atmospheric oxygen) are accepted
> as real events occurring near the end of the Cretaceous,
Both statements imply INCREASING oxygen levels in the late Cretaceous. From
according to Dudley's paper, oxygen near the end of the Cretaceous was
and had been doing so for some time, though (still according to him, and I
think maybe he
also quotes Rubin) it had not yet fallen to our present level. If they are
may need to look further at your supposition of increasing oxygen at the end of
Cretaceous being a 'real' event. I have no personal opinion on this, not having
researched it myself.
> I'm trying to define the problem more clearly. It's habitual <G>. I'm not a
> nor do I have any training in biology or earth sciences. But I do have a
> approach to problem solving.
Sounds good to me. I'm not a scientist either, only an engineer. I just
the impact could have caused the earlier volcanism, or that the volcanism could
caused the impact. Either or both could have caused a declining free oxygen
level due to
fires, though I suspect the impact could also have temporarily increased free
levels due to the disassociation of cubic miles of sea water. However, most
immediately reattached to the hydrogen (what a fireball that would make), or
with anything burnable during planetwide fires subsequent to the impact.
All the best,