Results 41 to 50 of about 2,095 (187)

The bivalve Cuneamya from the Late Ordovician of Bohemia [PDF]

Fossil Imprint, 2019
Abstract The bivalve species Cuneamya catilloides from the Late Ordovician of Bohemia, previously assigned to the genus Grammysia, is revised. Cuneamya catilloides is an important element of the Modiolopsis Community Group in the Letná Formation. The genus Grammysia very probably does not occur in the Ordovician of Bohemia and is restricted to the ...
openaire   +1 more source

New Perspectives on Glacial Geomorphology in Earth’s Deep Time Record

Frontiers in Earth Science, 2022
The deep time (pre-Quaternary) glacial record is an important means to understand the growth, development, and recession of the global cryosphere on very long timescales (106–108 Myr).
D. P. Le Heron, M. E. Busfield, X. Chen, M. Corkeron, M. Corkeron, B. J. Davies, P. Dietrich, J-F. Ghienne, C. Kettler, L. Scharfenberg, T. M. Vandyk, R. Wohlschlägl   +11 more
doaj   +1 more source

Key oil accumulation periods of ultra-deep fault-controlled oil reservoir in northern Tarim Basin, NW China

Petroleum Exploration and Development, 2022
A giant fault-controlled oilfield has been found in the ultra-deep (greater than 6000 m) Ordovician carbonate strata in the northern Tarim Basin. It is of great significance for hydrocarbon accumulation study and oil exploitation to determine the key oil
Shuai YANG, Guanghui WU, Yongfeng ZHU, Yintao ZHANG, Xingxing ZHAO, Ziye LU, Baoshou ZHANG   +6 more
doaj   +1 more source

Rapid recovery from the Late Ordovician mass extinction [PDF]

Proceedings of the National Academy of Sciences, 2004
Understanding the evolutionary role of mass extinctions requires detailed knowledge of postextinction recoveries. However, most models of recovery hinge on a direct reading of the fossil record, and several recent studies have suggested that the fossil record is especially incomplete for recovery intervals immediately after mass extinctions.
A Z, Krug, M E, Patzkowsky
openaire   +2 more sources

Warm-water Dasycladaceae algae from the Late Ordovician of the Parahio Valley, Spiti, India [PDF]

Estonian Journal of Earth Sciences, 2019
Warm-water Dasycladaceae algae Mastopora and Cyclocrinites were for the first time recorded from the Takche Formation (Upper Ordovician–lower Silurian), Parahio Valley, Spiti, India.
Ravi S. Chaubey, Olev Vinn, Birendra P. Singh, Om N. Bhargava, Subhay K. Prasad, Naval Kishore   +5 more
doaj   +1 more source

The appearance of Rosenella (stromatoporoid sponge) in Baltica: new species from the Pirgu Stage (Katian, Upper Ordovician) of Estonia [PDF]

Estonian Journal of Earth Sciences
The Katian Age, part of the Late Ordovician Epoch, was a period of significant stromatoporoid diversification. However, their fossil record is often less continuous, hindering our understanding of their diversity and diversification.
Juwan Jeon, Ursula Toom
doaj   +1 more source

Hydrocarbon Accumulation Mechanism of Ordovician in the Halahatang Area, Tarim Basin—Evidence From Organic Geochemistry

Frontiers in Earth Science, 2022
As an important oil and gas-bearing area in the Tarim Basin, the Halahatang Area has great potential for resource exploration. However, the research on oil and gas sources and the filling period of the Lower Paleozoic Ordovician is still limited. In this
Fei Huo, Fei Huo, Xingzhi Wang, Xingzhi Wang, Luping Li, Luping Li, Xin Luo, Xin Luo, Xiyan Yang, Xiyan Yang, Chen Shen, Chen Shen, Liang Li, Liang Li, Yunbo Ruan, Yunbo Ruan, Huiwen Huang, Huiwen Huang   +17 more
doaj   +1 more source

Dynamic geo‐hydrogeological monitoring‐driven situational awareness for real‐time floor water inrush risk prediction in deep mining

Deep Underground Science and Engineering, EarlyView.
The fused data extracted from the distributed monitoring system as the data basis, combined with dynamic geological data, are imported into a deep learning model. As the geological conditions of mining and excavation change, the risk of water inrush at the working face is retrieved in real time.
Yongjie Li, Huiyong Yin, Fangying Dong, Tao Wu, Chao Zhang   +4 more
wiley   +1 more source

World's fastest 10 000‐m breakthrough: The XY‐22 well redefines deep‐earth access in the Tarim Basin

Deep Underground Science and Engineering, EarlyView.
The Tarim Basin in northwestern China hosts one of the world's deepest petroleum systems, exemplified by the XY‐22 ultra‐deep well (bottom depth: 11 116 m; ~220°C, ~145 MPa). This study integrates tectonic mapping, geological cross‐sections, ultraviolet fluorescence microscopy, and optical photothermal infrared (OPTIR) spectroscopy to characterize ...
Qingwen Tan, Fangkai Liu, Sen Zhu, Guangyou Zhu, Haiping Huang   +4 more
wiley   +1 more source

Geochemistry and Geochronology of Magmatic Rocks in Southwestern and Northeastern Cambodia: Implications for the Tectonic Evolution and Metallogenesis of the Loei Fold Belt

Geological Journal, EarlyView.
The composition of intrusive rocks suggests that the magma was likely generated in a subduction‐related setting. The arc crustal thickness in the Phnom Sro Ngam and Halo Prospects was probably < 40 km during emplacement. Zircon U–Pb age range indicates a correlation with Loei Fold Belt magmatic activity.
Sirisokha Seang, Khin Zaw, Kakda Kret, Ivan Belousov, Kotaro Yonezu, Koichiro Watanabe, Charles Makoundi   +6 more
wiley   +1 more source