Re: Hell Creek and stegosaurs

["David Marjanovic" <david.marjanovic@gmx.at>]

----- Original Message -----
From: "Williams, Tim" <TiJaWi@agron.iastate.edu>
Sent: Monday, June 03, 2002 10:49 PM

> Name one fossil site that shows that large dromaeosaurids and stegosaurs
> co-existed in the same time and place.

I can't. But maybe that's a statistical affair... Large dromaeosaurids? You
mean *Deinonychus* size and above? There are AFAIK only *Utahraptor*,
*Achillobator*... and that was it, if we don't count *Megaraptor*.
*Achillobator* and *Megaraptor* far postdate all known stegosaurs. So it all
boils down to the question why no stegosaurs are known from EK North
America. Considering *Craterosaurus* and *Regnosaurus* (both nomina dubia,
could be the same) from England, *Wuerhosaurus* from China and
*"Katsuyamakensaurus"* from Japan, maybe that's an artifact of preservation
or, more likely IMHO, sampling. *Hesperosaurus* could have been expected for
similar reasons for a century and yet didn't turn up (in a publication at
least, still haven't read the paper...) until last year.
        (Ignoring *Paranthodon* which has dating problems
http://dinosauricon.com/genera/paranthodon.html and is apparently an
isolated fossil.)