Results 131 to 140 of about 345,840 (384)

Catalogue of the Hantken collection: carbonate microfacies photographs from 1872-82 [PDF]

open access: yes, 1996
Maximilian Hantken (1821-1893), founding professor of the Department of Palaeontology at Budapest University, was a pioneer in stratigraphic micropalaeontological studies.
Kázmér, Miklós
core  

Semi‐analytical solution for the stability of deep vertical shaft considering time‐dependent rock‐structure interaction

open access: yesDeep Underground Science and Engineering, EarlyView.
A novel cavity contraction solution and multilayer shaft wall model were developed to analyze deep shaft stability, considering rock viscosity, support structures, and water pressure, with successful validation through a Hulusu Coal Mine case study.
Bin Chen   +5 more
wiley   +1 more source

Lower Cretaceous Angiosperms [PDF]

open access: yesNature, 1910
IN the course of my work at the British Museum on Cretaceous plants, I have examined a number of more or less perfectly petrified “woods.” Such specimens have generally been classed together as “Gymnosperms,” so that they have received little attention from palaeobotanists. As I am undertaking an exhaustive study of the Cretaceous plants, the keeper of
openaire   +3 more sources

Most mammals do not wander: few species escape continental endemism

open access: yesEcography, EarlyView.
Terrestrial mammals are found nearly everywhere on Earth. Yet, most taxa are endemic to a single continent; geological, evolutionary, ecological, or physiological filters constrain geographic distributions. Here, we synthesize data on geography, taxonomy, lineage age, dispersal, body size, and diet for > 4000 terrestrial mammals prior to detectable ...
Meghan A. Balk   +10 more
wiley   +1 more source

Pterosaur teeth from the Southern Neuquén Basin (Patagonia, Argentina): New insights on the reconstruction of ornithocheiriform dental anatomy [PDF]

open access: yesActa Palaeontologica Polonica
The pterosaur fossil record of Argentina is increasing in recent times, both in the number of localities and their temporal range. The new materials are found in levels that span from the Late Triassic to the Late Cretaceous in age.
ALESSIO CIAFFI, FLAVIO BELLARDINI
doaj   +1 more source

A radiometric airborne geophysical survey of the Isle of Wight [PDF]

open access: yes, 2011
A high resolution airborne geophysical survey across the Isle of Wight and Lymington area conducted in 2008 provided the first modern radiometric survey across the geological formations that characterise much of southern England.
Beamish, David, White, James C.
core   +1 more source

Climate-mediated diversification of turtles in the Cretaceous

open access: yesNature Communications, 2015
Chelonians are ectothermic, with an extensive fossil record preserved in diverse palaeoenvironmental settings: consequently, they represent excellent models for investigating organismal response to long-term environmental change.
David B. Nicholson   +3 more
semanticscholar   +1 more source

Comprehensive Evaluation of In‐Situ Stress Field in Ultra‐Deep Bedrock Gas Reservoirs

open access: yesEnergy Science &Engineering, EarlyView.
Log interpretation results diagram of rock mechanical parameters for ultra‐deep bedrock in Well k1‐1. ABSTRACT Ultra‐deep bedrock gas exploration remains at a preliminary stage, where comprehensive in‐situ stress evaluation can provide crucial guidance for sweet spot prediction.
Houjiang Fan, Shuai Yin
wiley   +1 more source

A well-preserved vertebra provides new insights into rebbachisaurid sauropod caudal anatomical and pneumatic features [PDF]

open access: yesActa Palaeontologica Polonica
Rebbachisauridae is a clade of sauropod dinosaurs whose maximum diversification and abundance are known from the Cretaceous of South America. We describe an anterior caudal vertebra, MDPA-Pv 007, from the Upper Cretaceous of Argentine Patagonia, whose ...
GUILLERMO J. WINDHOLZ   +4 more
doaj   +1 more source

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