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Re: Signor/Lipps effect

Chad (etc.):

    In general, most people seem to believe that their was some sort of
decline of number of dinosaur species, and possibly a decline in the number
of individuals as well, during the last few million years of the Cretaceous.

    However, some others have found evidence that seems to show that (in a
few sites at least) the diversity of dinosaur species did not decrease at
that time.  Tracy Ford has references and has seen/spoken to at least one of
the workers who has found the evidence.

    As to whether there is any debate continuing - OF COURSE!!!  :-)   If
you ask 4 paleontologists a question they will have 5 different answers for

    Hope this info helps --- Tracy - Feel free to jump right in with your

        Allan Edels

-----Original Message-----
From: C. Laibly <laibly@blue.weeg.uiowa.edu>
To: dinosaurs <dinosaur@usc.edu>
Date: Monday, January 25, 1999 3:02 AM
Subject: Signor/Lipps effect

>Usually I just read, observe, and learn, but I have seen several opposing
>views on wether or not dinosaurs declined before the K/T boundary and am
>curious about everyone's opinion. My stratigraphy professor (U of Iowa)
>mentioned last semester that a decline had occurred prior to the
>bolide/comet date. I also remember a list member adamantly denouncing any
>decline and naming several late Maastrichtian sites with fossil evidence
>to prove his view. (Can't remember when, a few months back I believe..)
> Is this issue still in debate?
>Chad Laibly
>U of Iowa
>Geology B.S.