Results 41 to 50 of about 108 (100)

Silesaurid (Archosauria: Dinosauriformes) remains from the base of the Dockum Group (Late Triassic: Otischalkian) of Texas provide new insights to the North American record of dinosauriforms

The Anatomical Record, Volume 309, Issue 2, Page 293-313, February 2026.
Abstract Silesaurids (Archosauria: Dinosauriformes) are found in Middle to Upper Triassic deposits across Pangea, but few stratigraphic sections record the evolution of the group in one geographic area over millions of years. Here, we describe silesaurid remains from the oldest of the Upper Triassic stratigraphic sequence from the base of the Dockum ...
Frederick B. Tolchard, Brynden W. Perkins, Sterling J. Nesbitt   +2 more
wiley   +1 more source

Stress and Rock Failure Near Salt Bodies: Insights From Field Observations, Kinematic Modeling, and Mechanical Analysis Near Arches National Park, Paradox Basin, Utah

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 2, February 2026.
Abstract Salt's inherent weakness and capacity for ductile deformation create significant mechanical contrasts that locally perturb the stress field in surrounding rocks, often leading to deviations from regional tectonic stresses. Variations in local stress are a critical factor for wellbore stability, seal integrity, and fluid flow in subsurface ...
Lauren J. Reeher, Seth Busetti, Amanda N. Hughes, George H. Davis   +3 more
wiley   +1 more source

Osteohistological signal from the smallest known phytosaur femur reveals slow growth and new insights into the evolution of growth in Archosauria

Journal of Anatomy, Volume 247, Issue 3-4, Page 556-575, September/October 2025.
The paucity of small, skeletally immature individuals representing the earliest ontogenetic stages of extinct archosaurs complicates our understanding of the growth dynamics within and between species. The opportune finding of the smallest phytosaur femora reveals slow growth, a surprising signal considering that larger phytosaurs in North America have
Erika R. Goldsmith, Daniel E. Barta, Ben T. Kligman, Sterling J. Nesbitt, Adam D. Marsh, William G. Parker, Michelle R. Stocker   +6 more
wiley   +1 more source

Impact of environmental barriers on temnospondyl biogeography and dispersal during the Middle–Late Triassic

Palaeontology, Volume 67, Issue 5, September/October 2024.
Abstract Temnospondyls had a remarkable worldwide distribution throughout the Triassic at a time of periodic arid climates, and were a stable component of Triassic terrestrial ecosystems. Given the postulated ancestral relationship between temnospondyls and modern lissamphibians it is pertinent to recognize that the group may have exhibited some degree
Raphael Moreno, Emma M. Dunne, Eudald Mujal, Alexander Farnsworth, Paul J. Valdes, Rainer R. Schoch   +5 more
wiley   +1 more source

A new abelisaurid dinosaur from the end Cretaceous of Patagonia and evolutionary rates among the Ceratosauria

Cladistics, Volume 40, Issue 3, Page 307-356, June 2024.
Abstract Gondwanan dinosaur faunae during the 20 Myr preceding the Cretaceous–Palaeogene (K/Pg) extinction included several lineages that were absent or poorly represented in Laurasian landmasses. Among these, the South American fossil record contains diverse abelisaurids, arguably the most successful groups of carnivorous dinosaurs from Gondwana in ...
Diego Pol, Mattia Antonio Baiano, David Černý, Fernando E. Novas, Ignacio A. Cerda, Michael Pittman   +5 more
wiley   +1 more source

Variation in the sacrum of phytosaurs: New evidence from a partial skeleton of Machaeroprosopus mccauleyi

Journal of Anatomy, Volume 244, Issue 6, Page 959-976, June 2024.
Phytosaurs, a group of Triassic semi‐aquatic archosauriform reptiles, are thought to vary in their numbers of sacral vertebrae from two, the plesiomorphic condition for archosauriforms, to three, with the addition of a sacralized dorsal (i.e., dorsosacral) vertebra.
Caleb N. LePore, Matthew A. McLain
wiley   +1 more source

The osteology of Shuvosaurus inexpectatus, a shuvosaurid pseudosuchian from the Upper Triassic Post Quarry, Dockum Group of Texas, USA

The Anatomical Record, Volume 307, Issue 4, Page 1175-1238, April 2024.
Abstract A vast array of pseudosuchian body plans evolved during the diversification of the group in the Triassic Period, but few can compare to the toothless, long‐necked, and bipedal shuvosaurids. Members of this clade possess theropod‐like character states mapped on top of more plesiomorphic pseudosuchian character states, complicating our ...
Sterling J. Nesbitt, Sankar Chatterjee
wiley   +1 more source

Quantitative evidence for dimorphism suggests sexual selection in the maxillary caniniform process of Placerias hesternus.

PLoS ONE
Placerias hesternus, a Late Triassic dicynodont, is one of the last megafaunal synapsids of the Mesozoic. The species has a tusk-like projection on its maxillary bone, known as the caniniform process.
James L Pinto, Charles R Marshall, Sterling J Nesbitt, Daniel Varajão de Latorre   +3 more
doaj   +1 more source

First unambiguous dinosaur specimen from the Upper Triassic Chinle Formation in Utah

Geology of the Intermountain West, 2017
Triassic dinosaurs represent relatively rare but important components of terrestrial faunas across Pangea. Whereas this record has been well studied at various locales across the American West, there has been no previous systematic review of Triassic material assigned to Dinosauria from Utah.
Xavier Jenkins, John Foster, Robert Gay
openaire   +1 more source

Recognizing the ephemeral stream floodplain: Identification and importance of flood zones in drylands

Earth Surface Processes and Landforms, Volume 49, Issue 1, Page 210-235, January 2024.
Floodplains in ephemeral stream corridors share temporary inundation with dry channels, yet variations in hydrologic, geomorphic and biotic characteristics lead to unique functions in overbank areas. Based on a synthesis of the prior literature, definitions of the floodplain boundary and extent were revisited, and distinct floodplain styles were ...
Julianne E. Scamardo, Ellen Wohl
wiley   +1 more source