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Re: One last thing on the bitten _Edmontosaurus_



If this injury was indeed caused by a _T. rex_ , then wouldn't that destroy
the theory that _T rex_  used an infectious bite to kill it's prey, ala
komodo dragons?

If the tyrannosaur housed infectious bacteria in its mouth, the edmontosaur
never would have lived long enough for the bone to begin healing.

Keith


----- Original Message -----
From: "Jerry D. Harris" <dinogami@hotmail.com>
To: <dinosaur@usc.edu>
Sent: Sunday, February 11, 2001 10:05 AM
Subject: Re: One last thing on the bitten _Edmontosaurus_


> >The most relevant bit (written by Ken) was:
> >
> >      Actually, the height is 13 feet. The top 1/3 of one neural spine
> >      is obliquely sheared off leaving a U-shaped groove. There is some
> >      remodeling of the bone indicating some healing occured prior to
> >      death. Other neural spines are mangled, with at least two tooth
> >      punctures. These and the missing spine form a nice U-shape that
> >      conforms well with the cast of the T. rex skull we have. Jack has
> >      seen it and agrees that it most likely was done by a T rex,
> >      however, argues that it was a rare attack.
> >
> >I interpret that to mean that one spine has a small U-shaped groove
> >that looks like it was formed by a single tooth biting through it, and
> >the overall pattern of damage forms a larger U-shape that looks like
> >outline of the Tyrannosaur's jaw.  Jerry should comment if I've biffed
> >that description
>
>    Yes, SIR! Commenting, SIR! ("Prepare to comment...comment NOW!")
>
>    Of course, when I was in the process of applying the tendons to the
> specimen, I had a mere bachelor's degree and little hands-on
paleontological
> experience, so I may not have recognized "tooth marks" for what they were.
> However, my personal _recollection_ is that there weren't any obvious
> punctures (this may be my faulty memory, though, so don't take this as
> gospel!), although there are certainly gnarled, deformed areas that could
> easily be rehealed bite marks.  I am definitely looking forward to seeing
> figures in Ken's paper to see specifically what he is calling "tooth
marks."
>   After I move (again!, next weekend), I may see if I can dig up my old
> photos of the specimen -- I can't recall if I've got any close-ups or not,
> but if I do, I'll see if I can post them.  The description of the overall
> shape of the affected caudal area is more or less accurate -- I personally
> might describe it more as "parabolic" than "U-shaped," but that's a fine
> distinction.  It certainly does, as Ken says, conform nicely to the shape
of
> the front of a tyrannosaur mouth.
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Jerry D. Harris
> Dept of Earth & Environmental Science
> University of Pennsylvania
> 240 S 33rd St
> Philadelphia PA  19104-6316
> Phone: (215) 573-8373
> Fax: (215) 898-0964
> E-mail: jdharris@sas.upenn.edu
> and     dinogami@hotmail.com
> http://www.sas.upenn.edu/~jdharris
>
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