Re: Hell Creek and stegosaurs

["Steve Brusatte" <dinoland@lycos.com>]

On Mon, 3 Jun 2002 17:42:49   
 Mickey Mortimer wrote:
>Tim Williams wrote-
>
>> Name one fossil site that shows that large dromaeosaurids and stegosaurs
>> co-existed in the same time and place.
>
>Dromaeosaurs lived alongside stegosaurs in a several areas-
>Chipping Norton Formation (unnamed dromaeosaurids; Lexovisaurus? vetustus)
>Morrison Formation (unnamed "velociraptorine"; Hesperosaurus, Stegosaurus,
>Hypsirophus)
>Wealden Formation (Ornithodesmus; Regnosaurus)
>Lianmugin Formation (Phaedrolosaurus; Wuerhosaurus homheni)
>At least Phaedrolosaurus was large, with teeth twice the size of
>Deinonychus'.  The Morrison teeth described by Britt (1991) are only
>slightly smaller than Deinonychus'.

Before Mickey jumped in I, too, was going to mention the Morrison.  There have 
been some recent findings that have added onto Britt's 1991 study.  Some of 
these, which include a possibly diagnostic set of dromaeosaurid teeth (ick...), 
were mentioned in an abstract.  I'll try to dig it up.  But, to my knowledge, 
no major study has been published on them.  In any regard, it seems as if there 
was likely more of a stegosaur-dromaeosaurid overlap than once previously 
thought.

Steve

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