Results 21 to 30 of about 266 (116)

A new southern Laramidian ankylosaurid, Akainacephalus johnsoni gen. et sp. nov., from the upper Campanian Kaiparowits Formation of southern Utah, USA [PDF]

PeerJ, 2018
A partial ankylosaurid skeleton from the upper Campanian Kaiparowits Formation of southern Utah is recognized as a new taxon, Akainacephalus johnsoni, gen. et sp. nov.
Jelle P. Wiersma, Randall B. Irmis
doaj   +5 more sources

New fossil lizard specimens from a poorly-known squamate assemblage in the Upper Cretaceous (Campanian) San Juan Basin, New Mexico, USA [PDF]

PeerJ, 2020
Recent collection efforts in the upper Campanian (∼76-73.5 Ma) Fruitland and Kirtland formations of northwestern New Mexico have significantly increased the taxonomic diversity of lizards in this historically poorly understood squamate assemblage.
C. Henrik Woolley, Nathan D. Smith, Joseph J.W. Sertich   +2 more
doaj   +3 more sources

First remains of the enormous alligatoroid Deinosuchus from the Upper Cretaceous Menefee Formation, New Mexico [PDF]

PeerJ, 2021
The neosuchian Deinosuchus is known from numerous localities throughout the Campanian of North America, from New Jersey to Montana (USA) and as far south as Coahuila (Mexico). Here we describe six osteoderms, two vertebrae, and a partial tooth discovered
Benjamin F. Mohler, Andrew T. McDonald, Douglas G. Wolfe   +2 more
doaj   +3 more sources

A revised turtle assemblage from the Upper Cretaceous Menefee Formation (New Mexico, North America) with evolutionary and paleobiostratigraphic implications [PDF]

PeerJ
The middle Campanian Menefee Formation (Fm.) of the San Juan Basin of New Mexico is a relatively understudied terrestrial deposit in southern Laramidia preceding the fossil-rich upper Campanian Fruitland and Kirtland formations that have been studied for
Brent Adrian, Heather F. Smith, Andrew T. McDonald   +2 more
doaj   +3 more sources

A giant tyrannosaur from the Campanian–Maastrichtian of southern North America and the evolution of tyrannosaurid gigantism [PDF]

Scientific Reports
Tyrannosaurid dinosaurs dominated as predators in the Late Cretaceous of Laurasia, culminating in the evolution of the giant Tyrannosaurus rex, both the last and largest tyrannosaurid. Where and when Tyrannosaurini (T.
Sebastian G. Dalman, Mark A. Loewen, R. Alexander Pyron, Steven E. Jasinski, D. Edward Malinzak, Spencer G. Lucas, Anthony R. Fiorillo, Philip J. Currie, Nicholas R. Longrich   +8 more
doaj   +2 more sources

New monstersaur specimens from the Kaiparowits Formation of Utah reveal unexpected richness of large-bodied lizards in Late Cretaceous North America [PDF]

Royal Society Open Science
Monstersauria (Squamata, Anguimorpha) fossils are present in most Upper Cretaceous sedimentary basins in western North America, but despite almost a century of collection, their record remains extremely fragmentary.
C. Henrik Woolley, Joseph J. W. Sertich, Keegan M. Melstrom, Randall B. Irmis, Nathan D. Smith   +4 more
doaj   +2 more sources

Coahuilasaurus lipani, a New Kritosaurin Hadrosaurid from the Upper Campanian Cerro Del Pueblo Formation, Northern Mexico

Diversity
The Late Cretaceous of Western North America (Laramidia) supported a diverse dinosaur fauna, with duckbilled dinosaurs (Hadrosauridae) being among the most speciose and abundant members of this assemblage.
Nicholas R. Longrich, Angel Alejandro Ramirez Velasco, Jim Kirkland, Andrés Eduardo Bermúdez Torres, Claudia Inés Serrano-Brañas   +4 more
doaj   +2 more sources

Rise of the king: Gondwanan origins and evolution of megaraptoran dinosaurs [PDF]

Royal Society Open Science
Late Cretaceous Earth was dominated by theropods such as tyrannosauroids and megaraptorans; however, it is unclear how these clades diversified and grew to massive proportions.
Cassius Morrison, Charlie Roger Scherer, Ezekiel V. O’Callaghan, Collin Layton, Colin Boisvert, Mauro Aranciaga Rolando, Leroy Durrant, Pedro Salas, Steven J. R. Allain, Samuel J. L. Gascoigne   +9 more
doaj   +2 more sources

A large tyrannosaurid from the Late Cretaceous (Campanian) of North America [PDF]

Scientific Reports
The Tyrannosauridae emerged as the dominant large predators in Laurasia during the Late Cretaceous. Their evolution in North America culminated with the replacement of Albertosaurinae, Daspletosaurinae, and Teratophonei, with masses of 2-3 tonnes, by the
Nicholas R. Longrich, Sebastian Dalman, Spencer G. Lucas, Anthony R. Fiorillo   +3 more
doaj   +2 more sources

The first reported ceratopsid dinosaur from eastern North America (Owl Creek Formation, Upper Cretaceous, Mississippi, USA) [PDF]

PeerJ, 2017
Ceratopsids (“horned dinosaurs”) are known from western North America and Asia, a distribution reflecting an inferred subaerial link between the two landmasses during the Late Cretaceous.
Andrew A. Farke, George E. Phillips
doaj   +3 more sources