Results 71 to 80 of about 893 (201)

Did lingering ice sheets moderate anoxia in the early Palaeozoic of Libya?

The Hirnantian glaciation of West Gondwana produced a glacially sculpted topography, which is draped by organic-rich latest Ordovician and early Silurian ‘hot shales’.
Meinhold, Guido, Le Heron, D. P., Page, A. A., Whitham, A. G.   +3 more
core   +1 more source

Composition and significance of the Katian (Upper Ordovician) conodont fauna of the Vaux Limestone (‘Calcaire des Vaux’) in Normandy, France [PDF]

Estonian Journal of Earth Sciences, 2014
Study of new conodont collections from the Vaux Limestone exposed at its classical locality at Saint-Hilaire-la-Gérard in the Sées syncline, the conodont fauna of which was previously described in a preliminary way by Weyant et al.
Annalisa Ferretti, Andrea Messori, Stig M. Bergström   +2 more
doaj   +1 more source

Late Ordovician and early Silurian virgianid and stricklandioid brachiopods from North Greenland: implications for a warm‐water faunal province

Papers in Palaeontology, Volume 10, Issue 1, January/February 2024.
Abstract An unusually rich and diverse suite of virgianid brachiopods, hitherto poorly known, is systematically described here for the first time from the Ordovician–Silurian boundary interval (late Katian – Aeronian) of North Greenland. The Late Ordovician virgianids comprise typical taxa of the warm‐water Tcherskidium fauna (e.g.
Jisuo Jin, Christian M. Ø. Rasmussen, Peter M. Sheehan, David A. T. Harper   +3 more
wiley   +1 more source

The Upper Ordovician of Estonia: facies, sequences, and basin development [PDF]

Estonian Journal of Earth Sciences
Sequence stratigraphic analysis of the Nabala–Porkuni regional stages (RSs; upper Katian–Hirnantian) of Estonia clarifies the Late Ordovician evolution of the Estonian Shelf–Livonian Basin.
Mark T. Harris, Leho Ainsaar, Linda Hints, Peep Männik, Tõnu Meidla, Jaak Nõlvak, Tory Schultz, Peter M. Sheehan   +7 more
doaj   +1 more source

A new method for predicting the shale distribution of the Wufeng Formation in the Upper Yangtze Region, China

BSGF - Earth Sciences Bulletin, 2020
Taking the Late Ordovician Wufeng Formation (WFF) shale in the Upper Yangtze region as an example, we conducted a lithofacies distribution, thickness quantification, and paleo-topographic reconstruction of the Late Ordovician graptolite zones ...
Sun Shasha, Zhang Linna, Wang Hongyan, Dong Dazhong, Zhang Rong   +4 more
doaj   +1 more source

Orbital and Millennial‐Scale Cycles Through the Hirnantian (Late Ordovician) in Southern China

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 1, January 2024.
Abstract The Hirnantian period, making the end of the Ordovician with significant mass extinctions and large ice‐sheets, is a critical interval for studying paleoclimate variations. This research represents the first cyclostratigraphic study of this period, utilizing high‐resolution (1 mm sampling rate) geochemical data from the ∼7‐m thick SH‐1 drill ...
Siding Jin, Haiyang Cao, Mingcai Hou, Jiawei Wang, Chao Ma, Yu Liu   +5 more
wiley   +1 more source

A new species of graptolite from the western margin of the Kufra Basin, Libya

Normalograptus kufraensis sp. nov. occurs as monospecific assemblages in the Tanezzuft Formation at the western margin of the Kufra Basin (Jabal Eghei), southern Libya.
Elgardy, Mohamed, Meinhold, Guido, Le Heron, D. P., Page, A. A.   +3 more
core   +1 more source

Latest Ordovician (Hirnantian) miospores from NL-2 well, Algeria, North Africa, and their evolutionary significance

, 2015
Microfloristic assemblages have been recovered from the Hirnantian-aged Hassi el Hadjar (‘Argiles Microconglomratiques’) and M’Kratta formations in borehole Nl-2, northeast Algerian Sahara.
SPINA, AMALIA
core   +1 more source

Comparative Analysis of Shale Gas Enrichment and High Yield Geological Conditions of Wufeng–Longmaxi Formation and Qiongzhusi Formation in Southern Sichuan Basin

Geofluids, Volume 2024, Issue 1, 2024.
Wufeng–Longmaxi Formation and Qiongzhusi Formation are the significant shale gas exploration strata in China. The former has made a major breakthrough, and the exploration of the latter is restricted. At present, it shows good exploration potential in the Qiongzhusi Formation.
Majia Zheng, Hui Long, Ya Wu, Zhipeng Ou, Wenlei Liu, Dandan Wang, Wenyi Chen, Zhenxue Jiang, Xianglu Tang, Naser Golsanami   +9 more
wiley   +1 more source

Astronomical control on upper ordovician – lower silurian organic matter enrichment in South China

Frontiers in Earth Science
Astronomical forcing governed Late Ordovician–Early Silurian climate dynamics, yet high-resolution Astronomical Time Scales (ATS) and organic enrichment mechanisms during the end-Ordovician extinction remain poorly constrained.
Jinjie Yong, Shaoyong Hu, Jie He, Zhicheng Liu, Mengtian Zheng, Peng Luo, Xin Liu, Wei Dong   +7 more
doaj   +1 more source