Results 51 to 60 of about 308 (178)

Skånes Graptoliter [PDF]

open access: yesGeologiska Föreningen i Stockholm Förhandlingar, 1882
n ...
openaire   +2 more sources

Black Shale Lithofacies of the Wufeng–Longmaxi Formation in the Southeast Margin of Chongqing, China

open access: yesGeofluids, Volume 2025, Issue 1, 2025.
China’s shale gas has undergone nearly 20 years of exploration; unconventional oil and gas geological evaluation theories and research methods have been greatly enriched, but how to quickly, conveniently, and accurately identify the sweet spots of shale gas is still puzzling many researchers. This study focuses on the black shale of the Wufeng–Longmaxi
Junqing Liu   +12 more
wiley   +1 more source

Revisión de las localidades fosilíferas del departamento de Antioquia, Colombia

open access: yesBoletín de Ciencias de la Tierra, 2016
Aunque solamente el 11.5% del área de Antioquia tiene afloramientos de rocas sedimentarias, la revisión bibliográfica y elaboración de un mapa digital de las localidades fosilíferas (27), permite concluir que esta región tiene un gran potencial ...
Yenny Paola Valencia Giraldo   +4 more
doaj   +1 more source

NMR‐Based Quantitative Characterization of Water Imbibition in Deep Shale Rocks Under Different Pressures and Temperatures

open access: yesGeofluids, Volume 2025, Issue 1, 2025.
Unconventional tight/shale gas reservoirs have gained significant attention in the energy sector. The importance of temperature and pressure in shale imbibition lies in their profound influence on the kinetics, rate, and ultimate amount of water uptake, which directly impacts the efficiency of gas production.
Kaishuo Yang   +8 more
wiley   +1 more source

A database of detrital zircon geochronology ages of Cambrian to Paleogene deposits in South China

open access: yesGeoscience Data Journal, Volume 11, Issue 4, Page 405-413, October 2024.
Here, we had collect a database about the South China Phanerozoic detrital zircon geochronology data, and we published the database in DDE. We marked Kernel density estimates, ɛHf(t) vs. U‐Pb ages and the best age‐based multidimensional scaling plot from South China. Abstract Complications of detrital zircons databases provide a means for statistically
Tianle Xia   +6 more
wiley   +1 more source

Lower–Middle Ordovician brachiopods from the Eastern Cordillera of Peru: evidence of active faunal dispersal across Rheic and Iapetus oceans

open access: yesPapers in Palaeontology, Volume 10, Issue 5, September/October 2024.
Abstract New Floian and early middle Darriwilian brachiopod assemblages of the San José Formation of the Eastern Cordillera of Peru are presented. A new genus and species, Apurimella santiagoi, and two new species, Phragmorthis henrylunae and Nocturnellia ashaninka, are described.
Jorge Colmenar   +2 more
wiley   +1 more source

Gualcamayo Formation olistoliths (Middle Ordovician) embedded in the Rinconada Formation (Silurian-Devonian): paleontology, morphology and evolution remarks of the Ordovician and Silurian basins of Precordillera, Argentina

open access: yesLatin American Journal of Sedimentology and Basin Analysis, 2023
his contribution provides new paleontological and stratigraphic data for the Eastern Precordillera (San Juan province, Argentina) Ordovician basin. This is based on the description of a group of olistoliths, interpreted herein as coming from the lower ...
Fernando Enrique Lopez   +8 more
doaj   +2 more sources

The many ways toward punctuated evolution

open access: yesPalaeontology, Volume 67, Issue 5, September/October 2024.
Abstract Punctuated equilibria is a theory of evolution that suggests that species go through periods of stability followed by sudden changes in phenotype. This theory has been debated for decades in evolutionary biology, but recent findings of stasis and punctuated change in evolutionary systems such as tumour dynamics, viral evolution, and artificial
Salva Duran‐Nebreda   +6 more
wiley   +1 more source

XXXVI. On Graptolites

open access: yesTransactions of the Geological Society of Glasgow, 1882
I n the first edition of his famous work, the “Systema Naturæ,” published in 1736, the great Swedish naturalist, Linnæus, proposed the name Graptolithus for certain natural markings occasionally found upon stones, which are not true fossils, but are mere superficial stainings, having the ...
openaire   +2 more sources

Palaeoscolecids from the Ludlow Series of Leintwardine, Herefordshire (UK): the latest occurrence of palaeoscolecids in the fossil record

open access: yesPapers in Palaeontology, Volume 10, Issue 3, May/June 2024.
Abstract The documentation of cuticular micro‐ornament is vital for the taxonomic assignment of palaeoscolecids: vermiform lower Palaeozoic ecdysozoans interpreted as stem‐group priapulans or early diverging panarthropods. This is due to the absence of the character‐rich proboscis and tail hooks in palaeoscolecid material not from Burgess Shale‐type ...
Richard J. Howard   +4 more
wiley   +1 more source

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