Results 41 to 50 of about 33,062 (329)

Climate constrains the evolutionary history and biodiversity of crocodylians [PDF]

open access: yes, 2015
The fossil record of crocodylians and their relatives (pseudosuchians) reveals a rich evolutionary history, prompting questions about causes of long-term decline to their present-day low biodiversity.
Benson, RBJ   +5 more
core   +2 more sources

Scale and structure of time-averaging (age mixing) in terrestrial gastropod assemblages from Quaternary eolian deposits of the eastern Canary Islands [PDF]

open access: yes, 2007
Quantitative estimates of time-averaging (age mixing) in gastropod shell accumulations from Quaternary (the late Pleistocene and Holocene) eolian deposits of Canary Islands were obtained by direct dating of individual gastropods obtained from ...
Torres Pérez-Hidalgo, Trinidad José
core   +2 more sources

The paleobiological record of photosynthesis [PDF]

open access: yesPhotosynthesis Research, 2010
Fossil evidence of photosynthesis, documented in Precambrian sediments by microbially laminated stromatolites, cyanobacterial microscopic fossils, and carbon isotopic data consistent with the presence of Rubisco-mediated CO2-fixation, extends from the present to ~3,500 million years ago. Such data, however, do not resolve time of origin of O2-producing
openaire   +4 more sources

Functional diversity of marine ecosystems after the Late Permian mass extinction event [PDF]

open access: yes, 2014
Article can be accessed from http://www.nature.com/ngeo/journal/v7/n3/full/ngeo2079.htmlThe Late Permian mass extinction event was the most severe such crisis of the past 500 million years and occurred during an episode of global warming.
A Baud   +49 more
core   +1 more source

Paleoneuroanatomy of the European lambeosaurine dinosaur Arenysaurus ardevoli [PDF]

open access: yes, 2015
The neuroanatomy of hadrosaurid dinosaurs is well known from North America and Asia. In Europe only a few cranial remains have been recovered that include the braincase. Arenysaurus is the first European endocast for which the paleoneuroanatomy has been
Canudo, JI   +3 more
core   +10 more sources

Tubular microfossils from ∼2.8 to 2.7Ga-old lacustrine deposits of South Africa: A sign for early origin of eukaryotes? [PDF]

open access: yes, 2016
Unequivocal evidence for Archean eukaryotic life has been long sought for and is a matter of lively debate. In the absence of unambiguous fossils this debate has focused on biogeochemical signatures and molecular phylogenies.
Altermann, Wladyslaw   +3 more
core   +2 more sources

Biological implications of high-energy cosmic ray induced muon flux in the extragalactic shock model

open access: yes, 2011
A ~ 62 My periodicity in fossil biodiversity has been observed in independent studies of paleontology databases over ~0.5Gy. The period and phase of this biodiversity cycle coincides with the oscillation of our solar system normal to the galactic disk ...
Adrian L. Melott   +29 more
core   +1 more source

The case for dynamic subsidence of the U.S. east coast since the Eocene [PDF]

open access: yes, 2008
The dynamic subsidence of the United States east coast is addressed using the discrepancy between regional and global estimates of sea level, elevation of paleoshorelines, and adjoint models of mantle convection that assimilate plate motions and seismic ...
Gurnis, Michael   +3 more
core   +1 more source

Seven rules for simulations in paleobiology

open access: yesPaleobiology, 2020
. Simulations are playing an increasingly important role in paleobiology. When designing a simulation study, many decisions have to be made and common challenges will be encountered along the way.
Joëlle Barido‐Sottani   +5 more
semanticscholar   +1 more source

Inter‐microscope comparability of dental microwear texture data obtained from different optical profilometers: Part I Reproducibility of diet inference using different instruments

open access: yesThe Anatomical Record, EarlyView.
Abstract Dental microwear texture analysis (DMTA) has become a well‐established method for dietary inference and reconstruction in both extant and extinct mammals and other tetrapods. As the volume of available data continues to grow, researchers could benefit from combining published data from various studies to perform meta‐analyses.
Daniela E. Winkler, Mugino O. Kubo
wiley   +1 more source

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