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At 05:23 PM 2/24/98 -0600, Seth Ellestad wrote:
>Hmmm--and the Permo-Triassic was an even greater extinction. Any
>evidence of an even larger bolide impact (or impacts) associated
>with that one?
Not that I know of. In fact there is really no substantial evidence of an
impact at that time at all. If there *was* one, it was almost certainly
>tend to think, based purely on educated guesses, that we'll find
>out that extinctions occur when a combination of changes puts
>stress on certain types of organisms, the actual extinctions then
>probably being triggered by catastrophic events that happen to
> occur at those times.
Yep. More or less what many paleontologists who reject the simple impact
Please note here, I never said the impact was not *involved* in the
extinctions, just that *by* *itself* it was not sufficient.
>>The closest we have today are the Iceland volcanics. (And it is
>>interesting to note, the Late Pliestocene/Holocene has been a time of
>"Holocene". That seems to be a false division to me, one based on
>culture rather than significant changes in the turnover of life on
Yep, I agree. If it were up to me, I would make the Holocene, at most, a
substage within the Pliestocene.
But then, the current round of mass extinctions aren't over yet. When they
are, they may start to rival the K-T extinctions.
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