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Re: Mass extinction theories - critical omission



Just a brief return to the fray:


    I have mentioned several times that the bolide would probably remove a
good portion of the Ozone layer, as well as other major parts of the
atmosphere.  As to the Van Allen Belts, I'm not sure if we know how long
they have been at their current size and density, or how quickly they grow,
or deteriorate.  We also don't know how to check for their existance or
non-existance in the fossil record.  (Perhaps in relation to certain kinds
of extinction events???).

    I too have mentioned that stripping the atmosphere of its protective
layers (or as you suggest, of a protective ionization layer) would allow
increased radiation - which would kill now, kill later, AND ALSO MUTATE
SPECIES RAPIDLY - SOMETIMES SUCESSFULLY!!!!.

        Allan Edels


-----Original Message-----
From: Jim Choate <ravage@ssz.com>
To: dinosaur@usc.edu <dinosaur@usc.edu>
Date: Saturday, August 22, 1998 12:56 PM
Subject: Mass extinction theories - critical omission


>
>Hi,
>
>I've a question in regards the great impact theory of extinction. Given
that
>a large mass impacts the Earth and disrupts the atmosphere, photosynthesis,
>etc. why does nobody recognize that such an impact would seriously disrupt
>the Van Allen belt and as a consequence greatly increased levels of solar
>radiation would reach the ground (even through the nuclear winter clouds).
>This increased radiation would have a very detrimintal effect. Other than
>the direct deaths caused by the radiation surge the long-term effect in
>regards birth defects would be catastrophic in such a stressed environment.
>
>
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