Results 61 to 70 of about 1,858 (206)
Late Ordovician ironstone and its relation to ocean redox instability, climate and glaciation
Sedimentology, Volume 72, Issue 2, Page 631-665, February 2025.Abstract The Upper Ordovician (Katian) Neda Formation, a phosphatic ironstone, records a widespread but short‐lived shift to ferruginous waters across a vast epicontinental area. Lithofacies and stratigraphic reappraisal indicate that Neda ironstone deposition occurred on a storm‐dominated ramp when coastal upwelling emplaced eutrophic ferruginous ...
Edward J. Matheson +3 more
wiley +1 more source
Island Arc, Volume 34, Issue 1, January/December 2025.ABSTRACT An ostracod assemblage from the Late Ordovician (Katian) Phu Ngu Formation of northern Vietnam, South China paleoplate, yields typical Baltic and Laurentian‐affinity genera together with some endemic forms. Detailed paleontological and sedimentary analysis of the Phu Ngu Formation suggests it was deposited in a deeper marine forearc setting ...
Anna McGairy +9 more
wiley +1 more source
, 2003 Graptolites are the most important biostratigraphic tool in the study of the Silurian of the Argentine Precordillera. Since, however, the graptolites are concentrated primarily in the Lower Llandovery and Ludlow of the region, the ages of parts of some ...
Lenz, Alfred +2 more
core +1 more source
Black Shale Lithofacies of the Wufeng–Longmaxi Formation in the Southeast Margin of Chongqing, China
Geofluids, 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
Geofluids, 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
The use of graptolites in the stratigraphy of the Southern Uplands: Peach's legacy
, 2000 Lapworth, at the time of his 1878 paper on the Moffat Series, was the world's foremost expert on graptolites, and in that paper he gave the first great demonstration of the biostratigraphical value of graptolites.
A. W. A. Rushton
core +1 more source
A database of detrital zircon geochronology ages of Cambrian to Paleogene deposits in South China
Geoscience 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
Wenlock, Ludlow, and Pridoli? graptolites from Yulin, Guangxi, China
, 1996 Late Wenlock and Ludlow transition graptolites are better developed and more diverse in the Yulin region of Guangxi Province, South China, than elsewhere in China. The upper Homerian (upper Wenlock) graptolites, while moderately diverse, are not amenable
Alfred C. Lenz, Yu-Nan Ni, Xu Chen
core +1 more source
Transactions 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
Latin 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