Results 41 to 50 of about 3,916,400 (215)

First report of an aulaceratid stromatoporoid from the Ordovician of Baltica [PDF]

Estonian Journal of Earth Sciences
The aulaceratid stromatoporoids first appeared in the late Middle Ordovician and had achieved a worldwide distribution in tropical to subtropical shallow-marine environments by the Late Ordovician; however, their presence in Baltica has not been ...
Juwan Jeon, Ursula Toom
doaj   +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  

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

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

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

Equatorial cold-water tongue in the Late Ordovician

Geology, 2018
The eastern equatorial Pacific cold tongue (EEP-CT) today asserts a vital influence on ocean-atmosphere CO2 exchange and global climate patterns. Here, we report a similar equatorial cold tongue in the Late Ordovician peri-Gondwana region during drastic ...
Jisuo Jin, Renbin Zhan, R. Wu
semanticscholar   +1 more source

Machine Learning‐Driven Classification and Production Capacity Prediction of Tight Sandstone Reservoirs: A Case Study of the Taiyuan Formation, Ordos Basin

Energy Science &Engineering, EarlyView.
On the basis of core and log data, a Bayesian‐Optimized Random Forest model achieved 92.76% accuracy in classifying tight sandstone reservoirs. A gray relational analysis‐derived evaluation index shows > 80% consistency with actual gas zones. ABSTRACT Tight sandstone gas (TSG), an unconventional oil–gas resource, has heterogeneous reservoirs ...
Yin Yuan, Haijiao Fu, Detian Yan, Gang Wang, Shuguang Yang, Mengmeng Liu, Qingling Jiang, Xiaoming Wang, Wei Wang   +8 more
wiley   +1 more source