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Tyrannosaurus in Texas?
From: Ben Creisler
A new paper:
Steven L. Wick (2014)
New evidence for the possible occurrence of Tyrannosaurus in West
Texas, and discussion of Maastrichtian tyrannosaurid dinosaurs from
Big Bend National Park.
Cretaceous Research 50: 52–58
Speculation regarding Tyrannosaurus in West Texas has been largely
based upon a sub-adult tyrannosaurid maxilla from the Javelina
Formation (Late Cretaceous–Maastrichtian) of Big Bend National Park.
However, a very large anterior caudal vertebra, recently collected
from the Javelina Formation, exhibits a morphology that can
confidently be assigned to Tyrannosauridae and, because of its size,
likely pertains to an adult Tyrannosaurus. The stratigraphic position
of the specimen is closely bracketed by titanosaurid remains and
further supports coexistence of these taxa. The stratigraphic position
of the specimen possibly records one of the earliest occurrences of
Tyrannosaurus. If so, Tyrannosaurus likely existed during roughly
equivalent temporal intervals in disparate paleobiomes in both
northern and southern late Maastrichtian faunal realms of North