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Re: Feathers on Bloody Everything

Jeff Poling wrote:
> At 02:04 PM 10/6/98 -0400, Ronald Orenstein wrote:
> >In the midst of all the (premature?) excitement, folks, let's not forget
> >that there is pretty good evidence, in the form of integumentary casts and
> >similar fossils, that at least some adult dinosaurs did NOT have feathers -
> >including theropods like Carnotaurus.  Even if the new Therizinosaur is
>    According to Holtz (DML 1997?), making the above conclusion is shaky
> because the skin impressions in question were not formed in sediments that
> would have preserved feathers, or similar integument, had they been present.
        With all due respect to my good friend and partner in crime (even 
though he IS a Yalie...), I am not so sure his reasoning holds here.  We 
don't have the necessary taphonomic evidence to support this, especially 
when presumed soft-bodied or at least partially soft bodied invertebrates 
are known to survive both preservation in a very coarse-grain sandstone 
and subsequent low temperature-high pressure metamorphism into quartzites.
Give me a while to work out the geochemistry and the sedimentology of the 
Sihetun clastics before we go there, ok?

Josh Smith
University of Pennsylvania
Department of Earth and Environmental Science
471 Hayden Hall
240 South 33rd Street
Philadelphia, PA  19104-6316
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