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> From: email@example.com [mailto:firstname.lastname@example.org]On Behalf Of
> 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.
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
Both are relatively gracile forms, compared to "bruisers" like _Daspleto._,
_Tarbo._, and _Tyrannosaurus_.
Thomas R. Holtz, Jr.
Department of Geology Director, Earth, Life & Time Program
University of Maryland College Park Scholars
College Park, MD 20742
Phone: 301-405-4084 Email: email@example.com
Fax (Geol): 301-314-9661 Fax (CPS-ELT): 301-405-0796