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Re: very large animals

I am not aware of any special radiation during the Mesozoic.  However, based
on some experiments with Cretaceous age air trapped in amber, it seems that
the oxygen (O2) content of the atmosphere may have been double today's
concentration (nearly 40% versus 18%).  This MIGHT allow dinosaurs to easily
grow very large due the reduced needs to extract oxygen from the air.  There
is some additional speculation along this line, however, that's all it
really is - speculation.  (There are some problems with the porousity of
amber at different times of its formation - it might allow N2 and CO2 to
leak out, but trap the O2).

    Also, please remember that the general temperature during the majority
of Mesozoic was considerably warmer than today's climate.

    Allan Edels

-----Original Message-----
From: Earl Wood <candle@cncnet.com>
To: dinosaur@usc.edu <dinosaur@usc.edu>
Date: Sunday, February 01, 1998 3:06 AM
Subject: very large animals

>     Several ideas have been put forth on the large sizes of some
>animals, I would like to see some discussions of the effects of
>something abnormal on the growth glands and
>hormonal aberrations, if  most of the world was tropical or subtropical
>at the time does
>this suggest global warming and a heightening of  ultra violet or cosmic
>radiation ?
>I'm very curious ?
>           Earl Wood
>           candle@cncnet.com
>                                                   'tis better to light
>one candle
>                                                   than to curse the