Results 81 to 90 of about 1,166 (193)

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

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

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

A Hirnantian deep-water refuge for warm-water ostracods in Baltoscandia [PDF]

, 2015
The latest Ordovician is marked by a severe climate change, the Hirnantian glaciation. This climatic event affected many marine taxa including ostracods. Rich and abundant ostracod assemblages of the Baltic Palaeobasin were severly impoverished.
Meidla, T., Truuver, K.
core  

Palaeoecology and palaeogeography of Late Ordovician (Katian–Hirnantian) cephalopods of the Boda Limestone, Siljan district, Sweden

, 2014
The carbonates associated with the Late Ordovician (Katian–Hirnantian) Boda mounds of the Siljan district, Sweden, contain a rich cephalopod fauna.
Jan Ove R. Ebbestad, Kröger, Björn,, Björn Kröger, Ebbestad, Jan Ove R.,   +3 more
core   +1 more source

Carbon isotope chemostratigraphy and sea-level history of the Hirnantian Stage (uppermost Ordovician) in the Oslo-Asker district, Norway

, 2021
We present a 13Ccarb chemostratigraphy for the Late Ordovician Hirnantian Stage based on 208 whole-rock samples from six outcrops in the Oslo-Asker district, southern Norway.
Lehnert, Oliver,, Lehnert, Oliver, Bockelie, Johan Fredrik, Calner, Mikael, Joachimski, Michael M.,, Joachimski, Michael M., Rasmussen, Christian M. Ø., Calner, Mikael,, Calner, Hanna,, Rasmussen, Christian M.Ø., Calner, Hanna, Rasmussen, Christian M.Ø.,, Mikael Calner, Oliver Lehnert, Hanna Calner, Michael M. Joachimski, Johan Fredrik Bockelie, Christian M.Ø. Rasmussen   +17 more
core   +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

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

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

The first record of Hirnantian Ostracoda in South America: Implications for the biostratigraphy and paleozoogeography of the Paraná basin

, 2021
Herein is reported the first occurrence of ostracodes from the Iapó Formation, an uppermost Ordovician unit of the Rio Ivaí Group in the Paraná basin, Brazil.
Do Carmo, Dermeval Aparecido, Adôrno, Rodrigo Rodrigues, Rodrigues Adôrno, Rodrigo, Meidla, Tõnu, Salas, Maria Jose, Assine, Mario Luis, Assine, Mario Luis [UNESP], Antonietto, Lucas Silveira, Rodrigues, Lívia Cardoso Da Silva, Gonçalves, Lívio Reily De Oliveira, Denezine, Matheus, Matheus Denezine, Lucas Silveira Antonietto, Mario Luis Assine, Maria José Salas, Lívia Cardoso da Silva Rodrigues, Tõnu Meidla, Dermeval Aparecido Do Carmo, Rodrigo Rodrigues Adôrno, Lívio Reily de Oliveira Gonçalves   +19 more
core   +1 more source