Results 141 to 150 of about 34,326 (336)

A Problem in Paleobiology

, 2002
We present a stochastic model for the size of a taxon in paleobiology, in which we allow for the evolution of new taxon members, and both individual and catastrophic extinction events. The model uses ideas from the theory of birth and death processes.
Hughes, Barry D., Reed, William J.
openaire   +2 more sources

Holocene climate oscillations, seismotectonic events and human–environmental interactions reconstructed from the Giannades palaeolake on Corfu (Eastern Mediterranean, Greece)

Journal of Quaternary Science, EarlyView.
ABSTRACT The Mediterranean is particularly sensitive to rapid climate changes (RCCs) during the Holocene. An increasing number of natural climate archives revealed that socio‐economic developments were influenced by such RCCs since the Palaeolithic. However, multi‐millennial and high‐resolution archives are still rare and often located in mountainous ...
Esra Reichert, Peter Fischer, Bernd Zolitschka, Tina Georg, Lea Obrocki, Denis Scholz, Katja Sporn, Andreas Vött   +7 more
wiley   +1 more source

Osteometry of Duck Species in Northwestern Europe—A Reassessment of Woelfle's (1967) Dataset

International Journal of Osteoarchaeology, EarlyView.
ABSTRACT This study revisits and expands upon Elisabeth Woelfle's (1967) foundational analysis of bone morphology and osteometry, which has long been a key reference for zooarcheological identification of duck species in northwestern Europe. By examining Woelfle's unpublished measuring protocols and incorporating 523 newly measured specimens, we ...
Per G. P. Ericson, Nadja Pöllath
wiley   +1 more source

Lions as Bone Accumulators? Exploring Multi‐Predator Contributions to the Olduvai Carnivore Site (OCS) (Tanzania) Through AI and Metric Analyses

International Journal of Osteoarchaeology, EarlyView.
ABSTRACT Lions (Panthera leo) are apex predators with a well‐documented influence on ecological dynamics, yet their potential role as bone‐accumulating agents remains poorly understood and often debated. Previous taphonomic studies have largely attributed bone accumulations in African savannah ecosystems to other carnivores, such as spotted hyenas ...
Blanca Jiménez‐García, Enrique Baquedano, Manuel Domínguez‐Rodrigo   +2 more
wiley   +1 more source

Nemesis Reconsidered

, 2010
The hypothesis of a companion object (Nemesis) orbiting the Sun was motivated by the claim of a terrestrial extinction periodicity, thought to be mediated by comet showers.
Adrian L. Melott, Alroy, Alroy, Bambach, Clube, Cornette, Davis, Foote, Gies, Goodman, Gradstein, Hills, Hut, Iorio, Lieberman, Melott, Muller, Muller, Raup, Richard K. Bambach, Rohde, Scargle, Sepkoski, Sepkoski, Thompson, Torbett, Whitmire   +26 more
core   +1 more source

Sharp Force Trauma and Chop Mark Identification Bias: Experimental Evidence on the Effects of Bone Morphology, Cortical Thickness, and Ax Material

International Journal of Osteoarchaeology, EarlyView.
ABSTRACT Sharp force trauma (SFT) is the main criterion used to identify chop mark butchery in zooarchaeology, yet its reliability as a diagnostic feature has not been systematically tested. Chop marks reflect both cutting and fracturing processes and exhibit characteristics of both sharp and blunt trauma.
Tiffany Okaluk, Justin Dallmann, Haim Cohen, Tina L. Greenfield, Itzick Shai   +4 more
wiley   +1 more source

Geochemical analysis of Cenozoic fossil conifers at high latitudes: Implications for molecular preservation and environmental change [PDF]

, 2010
Fossil materials record ancient life and their adapted environment. Arctic plant fossils are critical for our understanding of the Earth’s paleoenvironment when high latitudes were under ice-free conditions.
Witkowski, Caitlyn
core   +1 more source

New Advances in the Deep Structure of the Pamir Plateau: A Review

Acta Geologica Sinica - English Edition, EarlyView.
Abstract The Pamir Plateau is situated at the northwestern edge of the India–Eurasia Plate collision zone, making it a key region for studying continental collision and plateau uplift. The deep structure and dynamic processes of this region have long been of great scientific interest.
Feng LIANG, Davlatkhudzha MURODOV, Obidjon KODIROV, Lihua FANG, Hong XIAO, Xiaoping MA, Guoming LEI, Jiayong YAN, Nuo LI, Meng WANG, Maksatbek SATYBAEV, Syed Tallataf Hussain SHAH, Umair Khan JADOON   +12 more
wiley   +1 more source

On the squamation of Australerpeton cosgriffi Barberena, a temnospondyl amphibian from the Upper Permian of Brazil

Anais da Academia Brasileira de Ciências, 2002
Abdominal scales of a juvenile specimen of Australerpeton cosgriffi Barberena 1998 are made of primary compact bone rich in osteocyte lacunae; vascular canals and primary osteons are rare with no sign of remodelling of the tissue by resorption and ...
DIAS ELISEU V., RICHTER MARTHA
doaj  

Dinosaur skull geometry does not follow functional optimization trends but facilitates adaptability

iScience
Summary: Dinosaurs exhibited a remarkable array of skull shapes and sizes. However, the geometry of the cranial skeleton and its different functional units (rostrum, orbital region, and braincase) has not been quantified biomechanically.
Stephan Lautenschlager, Minnie M. Cione, Grace Cowley, Benjamin J. Creasy, Harrison Everard, Oliver J. Graves, Poppy E. Hawkins, Alisa Plaksina, Helena N. Rowlstone, Austin M. Smith, Lauren M. Steward   +10 more
doaj   +1 more source