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Re: extinction 2
On 1/2/04 2:50 AM, "Simonyi" <firstname.lastname@example.org> wrote:
> - number 4. "Within a very short period of time (minutes, hours, days,
> weeks based on the distance) a large amount of fossils should have been
> produced in
> high density. Where are these?"
Anything that dies within minutes of an impact is, presumably, very close to
the point of impact. Anything close to the point of impact would be pretty
much obliterated from a fossil formation point of view.
More generally, though, having enough individuals die is likely not a major
bottleneck for fossil formation; most of the bottlenecks are likely at other
stages. Obviously, the overwhelming majority of deaths are not represented
as fossils, and only occasionally do mass graves present themselves. There
may be a mass grave fossil bed out there from the K/T event, just as flood
graveyards are out there, but likelihood of detection is not really that
high. Not a bad thing to look for, though.
> - number 5. "The referred book wittily calls the effect 'volley firing'.
> That is, the devastation would have depended neither on the age of the
> living thing nor
> on any other factor modifying the frequency of the death. In such a case,
> young individuals would have died in the same way as the old ones, the
> healthy ones, or the sick ones, etc. Have they found such unusual
Again, this is generally a problem with fossil frequencies across the board.
There must have been more babies dying than adults at all times, not just
during the K/T event, yet juveniles are rather rare. There are various
reasons for this, some are in the archives.