Results 11 to 20 of about 40,471 (242)

Large Igneous Province Record Through Time and Implications for Secular Environmental Changes and Geological Time‐Scale Boundaries

open access: yesGeophysical Monograph Series, Page 1-26., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Richard E. Ernst   +8 more
wiley  

+18 more sources

Characteristics and exploration prospects of Middle Permian reservoirs in the Sichuan Basin

open access: yesNatural Gas Industry B, 2015
In recent years, encouraging progress has been made in the Middle Permian natural gas exploration in the Sichuan Basin – numerous wells have obtained high-yield industrial gas flows in the dolomite porous reservoir sections in the Middle Permian Maokou ...
Guang Yang   +7 more
doaj   +3 more sources

Episodic hydrothermal alteration on Middle Permian carbonate reservoirs and its geological significance in southwestern Sichuan Basin, SW China

open access: yesPetroleum Exploration and Development
To analyze the episodic alteration of Middle Permian carbonate reservoirs by complex hydrothermal fluid in southwestern Sichuan Basin, petrology, geochemistry, fluid inclusion and U-Pb dating researches are conducted.
Mingyou FENG   +7 more
doaj   +3 more sources

Early-middle Permian Mediterranean gorgonopsian suggests an equatorial origin of therapsids. [PDF]

open access: yesNat Commun
AbstractTherapsids were a dominant component of middle–late Permian terrestrial ecosystems worldwide, eventually giving rise to mammals during the early Mesozoic. However, little is currently known about the time and place of origin of Therapsida. Here we describe a definitive therapsid from the lower–?middle Permian palaeotropics, a partial skeleton ...
Matamales-Andreu R   +6 more
europepmc   +5 more sources

Simulated warm polar currents during the middle Permian [PDF]

open access: yesPaleoceanography, 2002
During Permian stage 6 (Wordian, Kazanian) the Pangaean supercontinent was surrounded by a superocean: Panthalassa. An ocean general circulation model has been coupled to an atmospheric energy balance model to simulate the sensitivity of the Wordian climate (∼265 million years ago) to changes in greenhouse gas concentrations, high‐latitude geography ...
Winguth, A.   +7 more
openaire   +2 more sources

Biomineralization of primary carbonate cements: a new biosignature in the fossil record from the Anisian of Southern Italy

open access: yesLethaia, EarlyView., 2021
Biomineralization is a generic term used to indicate biological‐mediated mineral formation. In carbonate mineralization, nucleation of crystals can be: (1) controlled directly by the organisms, like in the skeletal formation of most metazoans; (2) induced by microbial communities, by indirect precipitation mediated by their metabolic activities; or (3)
Adriano Guido   +4 more
wiley   +1 more source

An abrupt extinction in the Middle Permian (Capitanian) of the Boreal Realm (Spitsbergen) and its link to anoxia and acidification [PDF]

open access: yes, 2015
The controversial Capitanian (Middle Permian, 262 Ma) extinction event is only known from equatorial latitudes, and consequently its global extent is poorly resolved.
Beauchamp, Benoit   +7 more
core   +2 more sources

Pennsylvanian-Early Triassic stratigraphy in the Alborz Mountains (Iran) [PDF]

open access: yes, 2009
New fieldwork was carried out in the central and eastern Alborz, addressing the sedimentary succession from the Pennsylvanian to the Early Triassic.
Al-Belushi   +92 more
core   +2 more sources

Bone histology of the graviportal dinocephalian therapsid Jonkeria from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa [PDF]

open access: yesActa Palaeontologica Polonica, 2021
Here we examine the bone histology of multiple skeletal elements of three individuals of Jonkeria from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa.
MOHD SHAFI BHAT   +2 more
doaj   +1 more source

The fossil record of early tetrapods: worker effort and the end-Permian mass extinction [PDF]

open access: yes, 2010
It is important to understand the quality of the fossil record of early tetrapods (Tetrapoda, minus Lissamphibia and Amniota) because of their key role in the transition of vertebrates from water to land, their dominance of terrestrial faunas for over ...
Bebber D.F.   +18 more
core   +3 more sources

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