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Re: Extinction Question and a Thank You!

To: dinosaur@usc.edu
Subject: Re: Extinction Question and a Thank You!
From: "T. Michael Keesey" <keesey@gmail.com>
Date: Mon, 07 Feb 2005 00:37:54 -0800
In-reply-to: <BAY101-F7B0C3D02B496F3313651698720@phx.gbl>
References: <1f4a892d05020600266e31ec3d@mail.gmail.com> <BAY101-F7B0C3D02B496F3313651698720@phx.gbl>
Reply-to: "T. Michael Keesey" <keesey@gmail.com>
Sender: owner-dinosaur@usc.edu

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

References:
- Re: Extinction Question and a Thank You!
  - From: "T. Michael Keesey" <keesey@gmail.com>
- Re: Extinction Question and a Thank You!
  - From: Tim Williams <twilliams_alpha@hotmail.com>

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