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Re: Theories on the extinction of dinosaurs
At 10:20 AM 11/12/99 -0500, Seosamh wrote:
>Since all three (impact, volcanism, increased atmospheric oxygen) are
>as real events occurring near the end of the Cretaceous, and the world wide
>mass extinctions took place then, is there some obvious gap in how those
>items might tie together?
In what sense? In the sense that they all occurred and caused possibly
synergistic biological effects? Or in the sense of them having a common cause?
The latter is almost entirely out of the question. And it is unnecessary
as well. Synergistic effects between various *independent* events is a
perfectly valid mode of explanation.
[Note, I am not yet convinced of the reality of the change in oxygen
levels, but you also left out a few other events: worldwide drop in
relative sea level, and possible widespread oceanic anoxia, to name just two].
>I used the metaphor of a jigsaw puzzle. We have several pieces in the fossil
>record. We have a notion of the broad outline of the puzzle, i.e, a plausible
>description of the extinction event(s) with causes and effects. What kind of
>information would enable us to say, "Of course!" and clear up the mystery?
A time machine? A time scope?
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