T. Williamson

Publications85
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Citations1,474
Highly Influential Citations177
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3. Paleocene Biochronology: The Puercan Through Clarkforkian Land Mammal Ages
A NEW GENUS AND SPECIES OF TYRANNOSAUROID FROM THE LATE CRETACEOUS (MIDDLE CAMPANIAN) DEMOPOLIS FORMATION OF ALABAMA
TLDR
Cladistic analysis indicates the new taxon is a basal tyrannosauroid and its presence in eastern North America suggests that the recent common ancestor of Tyrannosauridae probably evolved following the transgression of the Western Interior Seaway.
Diversity of late Maastrichtian Tyrannosauridae (Dinosauria: Theropoda) from western North America
TLDR
The tooth taxon Aublysodon mirandus was reinstated following the collection of nondenticulate tyrannosaurid premaxillary teeth from late Maastrichtian deposits in western North America, but is a nomen dubium because of the small size of Aublysdon crowns and evidence that some denticles develop late in growth in theropods.
A NEW GENUS OF DERIVED PACHYCEPHALOSAURIAN FROM WESTERN NORTH AMERICA
TLDR
Pachycephalosaurian phylogeny does not support Asian-North American contiguity throughout the Campanian and Maastrichtian and is indicated to support a single dispersal event from Asia into North America, followed by dispersal of Prenocephale and Tylocephalosaurus into Asia prior to the late Campanian is indicated.
THE SYSTEMATIC UTILITY OF THEROPOD ENAMEL WRINKLES
STEPHEN L. BRUSATTE,*'1 ROGER B. J. BENSON,2 THOMAS D. CARR,3 THOMAS E. WILLIAMSON,4 and PAUL C. SERENO5; 1Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road,…
Selachians from the Greenhorn Cyclothem ("Middle" Cretaceous: Cenomanian-Turonian), Black Mesa, Arizona, and the Paleogeographic Distribution of Late Cretaceous Selachians
Black Mesa in northeastern Arizona exposes sediments of late Cenomanian–Turonian age deposited during the transgressive–regressive Greenhorn cyclothem. These sediments contain a diverse selachian…
The origin and early evolution of metatherian mammals: the Cretaceous record
TLDR
Metatherian diversification patterns suggest that they were not strongly affected by a Cretaceous Terrestrial Revolution, but they clearly underwent a severe extinction across the K-Pg boundary.
Bistahieversor sealeyi, gen. et sp. nov., a New Tyrannosauroid from New Mexico and the Origin of Deep Snouts in Tyrannosauroidea
Skeletal remains of Late Cretaceous (Campanian and Maastrichtian) tyrannosauroids are rare in southwestern North America (Carr and Williamson, 2000). Historically, the identity and diversity of…
The phylogeny and evolution of Cretaceous–Palaeogene metatherians: cladistic analysis and description of new early Palaeocene specimens from the Nacimiento Formation, New Mexico
TLDR
Both the phylogenetic topology and information from new specimens support the validity of the genus Thylacodon and justify the recognition of a new species, T. montanensis, and suggest that Palaeogene taxa originated from only a few clades of Cretaceous species, all of which were relatively minor or very rare components of known Cret Jurassic mammalian faunas.
?Brachychampsa sealeyi, sp nov., (Crocodylia, Alligatoroidea) from the Upper Cretaceous (lower Campanian) Menefee Formation, northwestern New Mexico
ABSTRACT ?Brachychampsa sealeyi sp. nov. is a small alligatoroid based on a partial skull, associated partial mandible, and a dorsal? osteoderm from the Upper Cretaceous (lower Campanian) Menefee…
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