Results 61 to 70 of about 15,497 (264)

Early evidence of molariform hypsodonty in a Triassic stem-mammal [PDF]

Nature Communications, 2019
AbstractHypsodonty, the occurrence of high-crowned teeth, is widespread among mammals with diets rich in abrasive material, such as plants or soil, because it increases the durability of dentitions against wear. Hypsodont postcanine teeth evolved independently in multiple mammalian lineages and in the closely related mammaliaforms since the Jurassic ...
Tomaz P. Melo, Ana María Ribeiro, Agustín G. Martinelli, Marina Bento Soares   +3 more
openaire   +4 more sources

K-feldspar sand-grain provenance in the Triassic, west of Shetland : distinguishing first-cycle and recycled sediment sources?

, 2009
Sandstone provenance studies can help constrain palaeogeographic reconstructions and ancient drainage system scales and pathways. However, these insights can be obscured by difficulties in geochemically distinguishing or adequately characterising ...
Daly, J. Stephen, Shane Tyrrell, Tyrrell, Shane, Leleu, Sophie, J. Stephen Daly, Souders, A. Kate, Haughton, Peter D. W., Peter D.W. Haughton, Sophie Leleu, A. Kate Souders   +9 more
core   +1 more source

Endothermy, neuron counts, and other issues: Further remarks on neurocognitive evolution in fossil vertebrates

The Anatomical Record, EarlyView.
Abstract Last year, we challenged the view that large‐bodied theropod dinosaurs such as Tyrannosaurus rex resembled primates in cognition and behavior, a proposition made by Herculano‐Houzel in 2023. More recently, Jensen et al. have criticized our work on this topic, raising methodological and conceptual issues.
Kai R. Caspar, Cristián Gutiérrez‐Ibáñez, Hady George, Thomas R. Holtz Jr., Darren Naish, Grant R. Hurlburt   +5 more
wiley   +1 more source

The ecology and geography of temnospondyl recovery after the Permian–Triassic mass extinction

Royal Society Open Science
One of the mysteries of the Permian–Triassic mass extinction was the subsequent success of temnospondyls. Temnospondyls were key early tetrapods in the Carboniferous and Permian and hardly seem to be ideal pioneers in a tough post-extinction world.
Aamir Mehmood, Suresh A. Singh, Armin Elsler, Michael J. Benton   +3 more
doaj   +1 more source

The sauropodomorph biostratigraphy of the Elliot Formation of southern Africa: Tracking the evolution of Sauropodomorpha across the Triassic–Jurassic boundary [PDF]

Acta Palaeontologica Polonica, 2017
The latest Triassic is notable for coinciding with the dramatic decline of many previously dominant groups, followed by the rapid radiation of Dinosauria in the Early Jurassic.
Blair W. McPhee, Emese M. Bordy, Lara Sciscio, Jonah N. Choiniere   +3 more
doaj   +1 more source

Understanding the provenance and depositional conditions of Triassic sedimentary rocks from the Spiti region, Tethys Himalaya, India

Journal of Asian Earth Sciences: X, 2023
The Spiti region, renowned as the Museum of Indian Geology, is a world-famous sedimentary succession containing well-exposed sequences from Neoproterozoic to Cretaceous age. In this study, Triassic siliciclastic sedimentary rocks of the Lilang Supergroup
Javid A. Ganai, Shaik A. Rashid, Abdul Samad Siddiqui, Nurul Absar, Heena, Ghulam Jeelani   +5 more
doaj   +1 more source

A new species of Lonchidiidae (Hybodontiformes) from the Late Jurassic of Brazil (Aliança Formation, Jatobá Basin)

The Anatomical Record, EarlyView.
Abstract The Aliança Formation (Jatobá Basin) represents lacustrine deposits formed in oxygenated waters that hosted a diverse fauna, including Hybodontiform sharks. Within this group, the Family Lonchidiidae comprises 11 valid genera, with Parvodus previously reported in Brazilian deposits from the Brejo Santo Formation (Araripe Basin, Late Jurassic ...
Larissa de Souza Ribeiro, Marco Aurélio Gallo de França   +1 more
wiley   +1 more source

OLENEKIAN TO EARLY LADINIAN STRATIGRAPHY OF THE WESTERN PART OF THE AGHDARBAND WINDOW (KOPEH-DAG, NE IRAN)

Rivista Italiana di Paleontologia e Stratigrafia, 2018
The structural setting and the stratigraphy of the Early to Middle Triassic sedimentary succession exposed in the western part of the Aghdarband window (Kopeh Dag, NE Iran) is described. Six stratigraphic sections in the Sefid-Kuh Limestone, Nazar-Kardeh
MARCO BALINI, ALDA NICORA, STEFANO ZANCHETTA, ANDREA ZANCHI, RUBEN MARCHESI, IRENE VUOLO, MARYAM HOSSEINIYOON, MEHDI NOROUZI, SARA SOLEIMANI   +8 more
doaj   +1 more source

Comparative cranial biomechanics reveal macroevolutionary trends in theropod dinosaurs, with emphasis on Tyrannosauroidea

The Anatomical Record, EarlyView.
Abstract Tyrannosaurus is viewed as a model organism in vertebrate paleontology, with numerous studies analyzing its feeding biomechanics. Nonetheless, the evolution of this feeding performance has been under‐addressed in Tyrannosauroidea, especially in basal tyrannosauroids. Here we used muscle‐force reconstruction and finite element analysis (FEA) to
Evan Johnson‐Ransom, Paul Gignac, Daniel E. Barta, Ryan N. Felice, Eric Snively   +4 more
wiley   +1 more source

Taxonomic and ecologic transitions in Triassic marine bivalve communities [PDF]

PeerJ
The Permian–Triassic mass extinction was a pivotal event in shaping marine benthic ecosystems, leading to the rise of mollusks such as bivalves and gastropods as representatives of the Modern Evolutionary Fauna.
Xue Miao, Jinnan Tong, Yunfei Huang, Shiyan Zhang, Peishan Li, Yiran Cao, Daoliang Chu, Wolfgang Kiessling   +7 more
doaj   +2 more sources