Results 111 to 120 of about 225,457 (366)
A reappraisal of the Italian record of the Cretaceous pachycormid fish Protosphyraena Leidy, 1857 [PDF]
, 2017 The genus Protosphyraena is known mainly from partial remains, consisting of isolated blade-like teeth, conical rostra and scythe-like pectoral fins. This paper provides a new insight into partial specimens of the genus Protosphyraena from the Cretaceous
Amalfitano, Jacopo +3 more
core +3 more sources
Mesozoic clupeomorphs of North Africa: diversity and phylogeny [PDF]
Research & Knowledge, 2017 Clupeomorpha, nowadays represented among others by herrings, anchovies and sprats, possess a fossil record extended back at least to early Cretaceous.
Bouziane Khallouf +4 more
doaj +1 more source
On Interdependence of the Paleomagnetic Field Characteristics [PDF]
arXiv, 2007 The behaviour of the geomagnetic field characteristics (mean values of the paleointensity, amplitude of its variations and reversal frequency) during the last 170 million years was analyzed. It was found that the mean values of the paleointensity were in direct relation to amplitude of its variations and in reverse relation to reversal frequency.
arxiv
On climate response to changes in the cosmic ray flux and radiative budget [PDF]
, 2004 We examine the results linking cosmic ray flux (CRF) variations to global climate change. We then proceed to study various periods over which there are estimates for the radiative forcing, temperature change and CRF variations relative to today. These include the Phanerozoic as a whole, the Cretaceous, the Eocene, the Last Glacial Maximum, the 20th ...
arxiv +1 more source
Cycles of paleomagnetic activity in the phanerozoic [PDF]
arXiv, 2021 Quasi-periodic changes of the paleointensity and geomagnetic polarity in the intervals of 170 Ma to the present time and of 550 Ma to the present time were studied, respectively. It is revealed that the spectrum of the basic variations in the paleointensity and of the duration of the polar intervals is discrete and includes quasi-periodic oscillations ...
arxiv
Deep Underground Science and Engineering, EarlyView.The present study uses the Modified Mohr‐Coulomb true‐triaxial failure criterion (MMC_TT), which predicts the strength of rock better than the MGC criterion in laboratory true‐triaxial tests to overcome the limitations. Moreover, based on the data from previously published five vertical wells in the Krishna‐Godavari basin (K‐G basin), an empirical ...
Ravindra K. Burnwal, Aditya Singh
wiley +1 more source
Freshwater Biology, Volume 68, Issue 1, Page 115-126, January 2023., 2023 Abstract Body metrics are considered as master traits that regulate physiological, behavioural and life history features of planktic cyanobacteria and microalgae. Although the distribution of their morphological traits reflects the various trade‐offs and strategies needed for survival in pelagic habitats, previous methods for quantifying phytoplankton ...
Gábor Borics +7 more
wiley +1 more source
Quantum Dipolar Coupling Thermal Correction for NMR Signal during Natural Rock Flooding by Melding Experimentation and Numerical Simulation (Th-CENS) [PDF]
arXiv, 2022 Researchers have used NMR to measure multi-phase fluid saturation and distribution inside porous media of natural rock. However, the NMR signal amplitude suffers reduction with the increase of temperature. The main reason is the Transverse Overhauser Effect, where heating increases the freedom for ionic motion, affecting spinning behavior by having two
arxiv
El marco tectónico de la región caribeana y el recambio K/T de la fauna de mamíferos continentales de América del Sur [PDF]
, 2011 De acuerdo con el registro fósil, durante el Cretácico Tardío-Paleoceno Temprano ocurrió un intercambio de vertebrados continentales(e.g., serpientes bóidas, dinosaurios, mamíferos) entre las Américas.
Ortiz Jaureguizar, Edgardo +1 more
core
Soft-Shelled Turtles (Trionychidae) from the Cenomanian of Uzbekistan [PDF]
, 2014 Localities from the Cenomanian of Uzbekistan are the oldest in Middle Asia and Kazakhstan to preserve two broadly sympatric species of trionychid turtle. Material described here comes from multiple Cenomanian formations from the Itemir locality, and from
Danilov, Igor G., Vitek, Natasha S.
core +1 more source