Results 21 to 30 of about 68,053 (269)
Changes in shelf phosphorus burial during the Hirnantian glaciation and its implications [PDF]
Estonian Journal of Earth Sciences, 2023 The Late Ordovician mass extinction occurred during an icehouse interval, accompanied by the glaciation of the supercontinent Gondwana, which was located at the South Pole at that time.
Johann Müller +4 more
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Oil and gas sources in Shunbei Oilfield, Tarim Basin
Shiyou shiyan dizhi, 2020 The hydrocarbon sources in the Middle and Lower Ordovician in the Shunbei area of the Tarim Basin were studied based on the geochemical characteristics of oil and gas samples.
Rong GU, Lu YUN, Xiuxiang ZHU, Meng ZHU
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An Ordovician ostracod palaeopsychrosphere? [PDF]
Estonian Journal of Earth Sciences, 2023 Ostracods are tiny bivalved crustaceans with a fossil record extending into rocks of the Lower Ordovician. They occupy almost all aquatic environments today, from the ocean abyssal planes to damp forest leaf litter.
Anna McGairy +6 more
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The Ordovician System: From overlapping unit stratotypes to Global Boundary Stratotype Sections and Points [PDF]
Estonian Journal of Earth Sciences, 2023 For nearly a century the Ordovician System was hidden as Murchison and Sedgwick tussled over the overlapping ground between their Silurian and Cambrian systems.
David A. T. Harper +2 more
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Early Tremadocian graptolites from the Arivechi area, Sonora, northern Mexico [PDF]
Estonian Journal of Earth Sciences, 2023 Graptolites from the early Tremadocian Anisograptus matanensis Biozone are identified from east-central Sonora, northwestern Mexico, within a carbonate-shelf succession deposited on the southwestern continental shelf margin of Laurentia.
Dulce Raquel Reyes-Montoya +5 more
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Shiyou shiyan dizhi, 2023 From the eastern to the western part of Shunbei area in the Tarim Basin, the accumulations of marine oil and gas obviously decrease with the exploration risks significantly increasing.
Lixin QI, Yong DING
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The Evae transgression: a major event? [PDF]
Estonian Journal of Earth Sciences, 2023 The most extensive sea-level event of the Early Ordovician is known as the Evae transgression. During the highstand of this event, the conodont index species Oepikodus evae reached its acme and often coincided with the peak in conodont generic diversity.
Gisella M. Della Costa +1 more
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Shiyou shiyan dizhi, 2023 In recent years, some progress has been made in the exploration of Ordovician natural gas in the western Ordos Basin, among which, the Ordovician Kelimoli Formation has the highest degree of natural gas accumulation.
Huimin LI +7 more
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Ordovician collections stored at the National Museum of Natural History of the NAS of Ukraine [PDF]
Estonian Journal of Earth Sciences, 2023 We reviewed our departmentâs collections dealing with the Ordovician System, stored at the National Museum of Natural History of the National Academy of Sciences of Ukraine (NMNH NAS).
Galyna Anfimova, Volodymyr Grytsenko
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Late Ordovician gastropods from the Zhaolaoyu Formation in the southwestern margin of the North China Platform [PDF]
Estonian Journal of Earth Sciences, 2023 The Ordos Basin is located in the western part of the North China Platform and is the second largest sedimentary basin in China; the basin has a huge thickness of the Early Palaeozoic marine deposits, especially the Ordovician ones.
Rao Fu +6 more
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