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Fw: Dinosaur Discs




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> From: Ralph Miller III <gbabcock@best.com>
> To: Dwight.Stewart@VLSI.com; 'dinosaur@usc.edu '@usc.edu
> Subject: Re: Dinosaur Discs
> Date: Thursday, October 01, 1998 6:11 AM
> 
> Gregory S. Paul and Terry L. Chase addressed this subject on page 245 of
> the following article:
> 
> Paul, G.S., and Chase, T. 1989. Reconstructing Extinct Vertebrates.
239-256
> in Hodges, E. (ed), The Guild Handbook of Biological Illustration. Van
> Nostrand Reinhold, New York.
> 
> They write:
> "To connect the vertebrae, articulate the zygapophyses (the small
> interlocking articular surfaces on each vertebra, shown in figure 14-3b)
> and align each centrum parallel to the next.  Keep the centra separated
> from one another by about ten percent of the average length of either
> adjacent centrum.  In life, this space was filled by a flexible
> intervertebral cartilaginous disc."
> 
> The illustrations provided clearly show these reconstructed discs.  If a
> reconstruction does not account for them, it is in error, but I think
that
> some of the simplified dinosaur skeletons we see illustrated may, in
fact,
> incorporate the disc information, but that the reproduction of the image
> lacks the resolution needed to properly display the discs.  Artists may
> choose to leave out some such details in order to avoid putting extra
> effort into illustrations that will lose the details when they are
printed.
>  It is also true that actual skeletons can present a myriad of details
that
> are difficult for the eye to absorb in a small image, and are more
readily
> discerned in a "detail" which illustrates specific features of a portion
of
> the skeleton.
> 
> -- Ralph Miller III     gbabcock@best.com