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Hi All -
This just out:
Urban, M.A., and Lamanna, M.C. 2007. Evidence of a giant tyrannosaurid
(Dinosauria: Theropoda) from the Upper Cretaceous (?Campanian) of Montana.
Annals of the Carnegie Museum 75(4):231-235.
ABSTRACT: We report an isolated right lacrimal of a tyrannosaurid theropod
dinosaur, probably from the Upper Cretaceous (upper Campanian) Judith River
Formation of Fergus County, Montana. The lacrimal was originally associated
with the holotype of the giant crocodylian Deinosuchus rugosus, but was
later identified as that of a tyrannosaurid. It is of comparable size to the
corresponding element in the gigantic Maastrichtian tyrannosaurid
Tyrannosaurus. Moreover, comparison of the lacrimal to those of other
tyrannosaurids tentatively supports its referral to this genus.
Consequently, provided that its stratigraphic provenance has been correctly
identified, the specimen represents the oldest-known North American record
of a Tyrannosaurus-sized tyrannosaurid, and possibly the most ancient
occurrence of this genus yet documented.
Jerry D. Harris
Director of Paleontology
Dixie State College
225 South 700 East
St. George, UT 84770 USA
Phone: (435) 652-7758
Fax: (435) 656-4022
"Trying to estimate the divergence times
of fungal, algal or prokaryotic groups on
the basis of a partial reptilian fossil and
protein sequences from mice and humans
is like trying to decipher Demotic Egyptian with
the help of an odometer and the Oxford
-- D. Graur & W. Martin (_Trends
in Genetics_ 20, 2004)