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Re: Extinction Question and a Thank You!

On Sun, 06 Feb 2005 14:35:50 -0600, Tim Williams
<twilliams_alpha@hotmail.com> wrote:
> The most recent common ancestor of modern sharks (Neoselachii) probably
> first appeared in the Triassic or Jurassic.  But many modern shark orders
> and families do not make an appearance in the fossil record until the
> Cretaceous.

Whoops! Well, it's still post-Permian, which is the basic point I was making.
Thanks for the correction.
-- Mike Keesey