Results 61 to 70 of about 254 (156)

New data on acritarchs from the Upper Ordovician of the Tungus basin, Siberian Platform [PDF]

Estonian Journal of Earth Sciences, 2014
Distinctive late Ordovician acritarch assemblages have been discovered for the first time from about a 100 m sedimentary succession exposed along the Bol¢shaya Nirunda River in Siberia.
Elena Raevskaya, Andrei Dronov
doaj   +1 more source

Solid Earth Carbon Degassing and Sequestration Since 1 Billion Years Ago

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 11, November 2024.
Abstract Solid Earth CO2 outgassing, driven by plate tectonic processes, is a key driver of carbon cycle models. However, the magnitudes and variations in outgassing are poorly constrained in deep‐time. We assess plate tectonic carbon emissions and sequestration by coupling a plate tectonic model with reconstructions of oceanic plate carbon reservoirs ...
R. Dietmar Müller, Adriana Dutkiewicz, Sabin Zahirovic, Andrew S. Merdith, Christopher R. Scotese, Benjamin J. W. Mills, Lauren Ilano, Ben Mather   +7 more
wiley   +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

Bioturbators as ecosystem engineers in space and time

Palaeontology, Volume 67, Issue 6, November/December 2024.
Abstract Biogenic sedimentary structures offer a unique perspective for understanding the role of the biosphere in the interaction with other Earth subsystems and the building up of our planet. The record of their ancient equivalents provides a wealth of information for reconstructing the role of bioturbators as ecosystem engineers using multiple ...
M. Gabriela Mángano, Luis A. Buatois, Nicholas J. Minter, Romain Gougeon   +3 more
wiley   +1 more source

Miospore assemblages from Late Ordovician (Katian-Hirnantian), Ghelli Formation, Alborz Mountain Range North-eastern Iran: Palaeophytogeographic and palaeoclimatic implications [PDF]

Journal of Sciences, Islamic Republic of Iran, 2016
Well-preserved miospore assemblages are recorded from the Late Ordovician (Katian-Hirnantian), Ghelli Formation in Pelmis-gorge at the north-eastern Alborz Mountain The palynomorphs were extracted from siliciclastic deposits which are well-dated by using
M. Ghavidel-syooki
doaj  

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

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

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

Subaerial speleothems and deep karst in central Sweden linked to Hirnantian glaciations [PDF]

Journal of the Geological Society, 2015
The limestones of the upper Katian Boda mud mounds (Ordovician) of the Siljan district in central Sweden are deeply fractured. The fissures were partly synsedimentary and are often lined with stromatolite-like crusts. These crusts thus far are the only known subaerial Ordovician speleothems.
Kröger, Björn, Ebbestad, Jan Ove R., Lehnert, Oliver, Ullmann, Clemens V., Korte, Christoph, Frei, Robert, Mac Ørum Rasmussen, Christian   +6 more
openaire   +2 more sources

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