RE: Tyrannosauridae

[Paleo_Mont <paleo_mont@excite.com>]

Thanks Tom,
like i said i dont know Tyrannosaurs that well :?)


On Mon, 10 Dec 2001 08:37:45 -0500, tholtz@geol.umd.edu wrote:

  > From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf Of
  > Paleo_Mont
  >
  > judith river formation:
  > _Albertasaurus sarcophagus_'Flesheating lizard from Alberta'
  > (nice name)
  >
  > two medicine formation:
  > Gorgosaurus liberatus  not sure on the name there.
  
  _Gorgosaurus libratus_ means: free (as in "freely moving") Gorgon lizard.
  
  Not quite.
  
  The type, and so far all specific diagnostic material, of _Albertosaurus
  sarcophagus_ is from the Horseshoe Canyon Formation.  The type, and so far
  all specific diagnostic material, of _Gorgosaurus libratus_ is from the
  (stratigraphically lower) Dinosaur Park Formation.  However, there is
  additional material (a good skeleton from the Two Medicine, for instance)
  which have yet to be studied in detail which might belong to one, the
other,
  or neither species.
  
  There is a LOT of tyrannosaurid material throughout the Judithian and
  Edmontonian of the Western Interior which might be from either of these
two,
  or _Daspletosaurus_, but at present telling these two apart from
postcrania
  is similar to telling _Centrosaurus_ from _Styracosaurus_ without their
  heads...
  
  Both are relatively gracile forms, compared to "bruisers" like
_Daspleto._,
  _Tarbo._, and _Tyrannosaurus_.
  
                Thomas R. Holtz, Jr.
                Vertebrate Paleontologist
  Department of Geology         Director, Earth, Life & Time Program
  University of Maryland                College Park Scholars
                College Park, MD  20742
  http://www.geol.umd.edu/~tholtz/tholtz.htm
  http://www.geol.umd.edu/~jmerck/eltsite
  Phone:        301-405-4084    Email:  tholtz@geol.umd.edu
  Fax (Geol):  301-314-9661     Fax (CPS-ELT): 301-405-0796
  


K.Wicks
Paleo Mont - www.geocities.com/paleo_mont
Paleo Mont Park - www.geocities.com/paleo_montpark





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