3. Paleocene Biochronology: The Puercan Through Clarkforkian Land Mammal Ages
- Donald L. Lofgren, J. Lillegraven, W. Clemens, P. Gingerich, T. Williamson, M. Woodburne
- Geology
- 31 January 2004
Diversity of late Maastrichtian Tyrannosauridae (Dinosauria: Theropoda) from western North America
- Thomas D. Carr, T. Williamson
- Environmental Science, Geography
- 1 December 2004
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 AND SPECIES OF TYRANNOSAUROID FROM THE LATE CRETACEOUS (MIDDLE CAMPANIAN) DEMOPOLIS FORMATION OF ALABAMA
- Thomas D. Carr, T. Williamson, D. Schwimmer
- Geography, Biology
- 11 March 2005
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.
A NEW GENUS OF DERIVED PACHYCEPHALOSAURIAN FROM WESTERN NORTH AMERICA
- T. Williamson, Thomas D. Carr
- Environmental Science
- 14 January 2003
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.
Bistahieversor sealeyi, gen. et sp. nov., a New Tyrannosauroid from New Mexico and the Origin of Deep Snouts in Tyrannosauroidea
- Thomas D. Carr, T. Williamson
- Environmental Science
- 29 January 2010
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 SYSTEMATIC UTILITY OF THEROPOD ENAMEL WRINKLES
- S. Brusatte, R. Benson, Thomas D. Carr, T. Williamson, P. Sereno
- Environmental Science
- 12 December 2007
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
- T. Williamson, J. Kirkland, S. Lucas
- Environmental ScienceJournal of Paleontology
- 1 May 1993
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
- T. Williamson, S. Brusatte, G. Wilson
- Geography, Environmental ScienceZooKeys
- 17 December 2014
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.
The phylogeny and evolution of Cretaceous–Palaeogene metatherians: cladistic analysis and description of new early Palaeocene specimens from the Nacimiento Formation, New Mexico
- T. Williamson, S. Brusatte, Thomas D. Carr, A. Weil, Barbara R. Standhardt
- Geography, Environmental Science
- 1 December 2012
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
- T. Williamson
- Biology
- 19 September 1996
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…
...
...