Results 91 to 100 of about 1,776,549 (292)

Environmental and geological controls on the diversity and distribution of the sauropodomorpha [PDF]

, 2010
Sauropodomorph dinosaurs were an important component of Mesozoic terrestrial ecosystems. Their diversity and abundance fluctuated throughout the Mesozoic but whether this reflects genuine biological changes or merely variations in our sampling of the ...
Mannion, P.D.
core  

First evidence of a mandibular crest in Brasileodactylus Kellner, 1984 (Pterosauria, Pteranodontoidea, Anhangueridae), with comments on pterosaur headcrests

The Anatomical Record, EarlyView.
Abstract Brasileodactylus araripensis Kellner, 1984, is a toothed pterosaur from the Lower Cretaceous Romualdo Formation of the Araripe Basin, Brazil. Traditionally regarded as crestless, the species has been central to debates on anhanguerid taxonomy, as most members of the clade possess well‐developed sagittal cranial or dentary crests.
Anderson da Silva Nascimento, Rubi Vargas Pêgas, Alessandra Silveira Machado, Ricardo Tadeu Lopes, Fabiana Rodrigues Costa   +4 more
wiley   +1 more source

Morphological plasticity in the dentition of the lungfish Gnathorhiza from the Permian of Brazil: A population‐level geometric morphometric analysis

The Anatomical Record, EarlyView.
Abstract Dental plates are pivotal in the lungfish paleontological record, constituting highly mineralized structures resilient to diagenetic processes. This study provides a detailed description and quantitative shape analysis of 95 newly discovered Gnathorhiza sp. dental plates from the Middle–Late Permian Corumbataí Formation, Brazil.
Mauro B. S. Lacerda, Gustavo H. N. Petreca, Gabriel E. B. de Barros, Ana Emilia Quezado, Marcelo A. Fernandes   +4 more
wiley   +1 more source

Bioerosion traces in bones reveal an increase in ethological diversity in the insect exploitation of carcasses in the late Triassic

The Anatomical Record, EarlyView.
Abstract This study presents the first detailed description of bioerosion traces produced by insects in bones from the Santa Cruz Sequence (early Carnian, Santa Maria Supersequence, Brazil). An array of traces is reported, consisting of notches, a tube, trails of grooves attributed to the ichnotaxon Osteocallis mandibulus and ornamented depressions ...
Lucca S. Cunha, Francesco Battista, Heitor Francischini   +2 more
wiley   +1 more source

Southward-Directed Subduction of the Farallon–Aluk Spreading Ridge and Its Impact on Subduction Mechanics and Andean Arc Magmatism: Insights From Geochemical and Seismic Tomographic Data

Frontiers in Earth Science, 2020
Since the initial proposal of the past existence of a southward-directed mid-ocean ridge–subduction interaction in the Andes during Late Cretaceous–Paleogene times, several studies have been devoted to uncover the tectonomagmatic evidence of this process.
Sofía B. Iannelli, Sofía B. Iannelli, Lucía Fernández Paz, Lucía Fernández Paz, Vanesa D. Litvak, Vanesa D. Litvak, Guido Gianni, Guido Gianni, Lucas M. Fennell, Lucas M. Fennell, Javiera González, Friedrich Lucassen, Simone Kasemann, Verónica Oliveros, Andrés Folguera, Andrés Folguera   +15 more
doaj   +1 more source

An emendation of some Cretaceous species of "Reophax" (Foraminiferida) from northwest Europe and Poland [PDF]

, 1995
The classification of some deep-water agglutinated foraminifera identified as Reophax minuta Tappan, 1940 is revised based upon examination of type material.
Kaminski, M.A., Geroch, S.
core  

Soft-Shelled Turtles (Trionychidae) from the Bissekty formation (Late Cretaceous: Late Turonian) of Uzbekistan: Shell-Based Taxa [PDF]

, 2013
In this paper we describe previously unpublished trionychid turtle material, consisting of numerous shell fragments, from the Late Cretaceous (late Turonian) Bissekty Formation of the Dzharakuduk locality in Uzbekistan.
Vitek, Natasha S., Danilov, Igor G.
core   +1 more source

Cortical bone geometry and static gravitational loads in neosauropod dinosaurs: Implications for biomechanical constraints on terrestrial gigantism

The Anatomical Record, EarlyView.
Abstract Sauropod dinosaurs achieved unprecedented terrestrial gigantism, raising questions about the biomechanical limits of bone under extreme gravitational loads. We estimated static gravitational pressures (Pg) on appendicular cortical bone in neosauropods, including diplodocoids, brachiosaurids, and titanosaurs.
Tito Aureliano, Aline M. Ghilardi, Holly N. Woodward, Horácio W. L. Alves, Guilherme M. Sipahi   +4 more
wiley   +1 more source

Paleoecology of late cretaceous coccolithophores

, 2021
Coccolithophores, common primary producers in Mesozoic, Cenozoic, and present oceans, are significant components of the earth’s biogeochemical cycles. Being the most productive calcifying organism on earth, their carbonate oozes play a major role in fixing \(CO_2\), thereby forming the most important long-term \(CO_2\) sink throughout the last 100 Ma ...
Püttmann, Tobias (Dr. rer. nat.), Mutterlose, Jörg (Prof. Dr.)   +1 more
openaire   +1 more source

Deciphering the Palimpsest: Chronological Uncertainty and the Interpretation of Mining Landscapes at Písečný vrch (Czech Republic)

Archaeological Prospection, EarlyView.
ABSTRACT We investigated the Písečný vrch (Czech Republic), a site exploited for quartz mining in both prehistoric times and the 20th century. Due to their morphological similarity across all mining periods, the differentiation between pits with archaeological potential and recent ones is challenging.
Jan Fišer, Petr Krištuf, Jan Kropáček, Vojtěch Barták, Lenka Starková, Vítězslav Moudrý   +5 more
wiley   +1 more source