Results 21 to 30 of about 3,916,400 (215)
Evolution of prototype basin and change of tectonic-sedimentary pattern in Paleozoic, Ordos Basin
Shiyou shiyan dizhi, 2022 The Ordos Basin is a craton basin developed based on the Precambrian rift system during Permian. It has experienced two stages of evolution including the Early Paleozoic craton marginal depression and Late Paleozoic intra-craton depression.
Faqi HE, Fubin WANG, Liguo GUO, Chuan AN
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Was the Late Ordovician mass extinction truly exceptional?
Trends in Ecology & Evolution, 2023 The Late Ordovician mass extinction event is the oldest of the five great extinction events in the fossil record. It has long been regarded as an outlier among mass extinctions, primarily due to its association with a cooling climate.
C. Rasmussen +3 more
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The earliest known stromatoporoid and its contribution to reef construction [PDF]
Estonian Journal of Earth Sciences, 2023 Stromatoporoid-type hypercalcified sponges are known to have contributed to the global reef system since the late Middle Ordovician until their major disappearance in the latest Devonian.
Juwan Jeon +6 more
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A nutrient control on expanded anoxia and global cooling during the Late Ordovician mass extinction
Communications Earth & Environment, 2022 Expanded ocean anoxia and global cooling have been invoked as major causal mechanisms for the Late Ordovician mass extinction, but the factors underpinning the extinction remain unresolved.
Zhen Qiu +8 more
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The earliest cornulitid on the internal surface of the illaenid pygidium from the Middle Ordovician of Estonia [PDF]
Estonian Journal of Earth Sciences, 2017 The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of Estonia. Internal annulation is present in all Middle Ordovician cornulitids and could be a plesiomorphic character for the group.
Olev Vinn, Ursula Toom, Mare Isakar
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The tarphyceratid cephalopod Trocholites in the Middle–Upper Ordovician of the Prague Basin —the Baltican element in peri-Gondwana [PDF]
Acta Palaeontologica Polonica, 2023 The vast majority of cephalopods of the order Tarphyceratida are known from regions that were located at mid- or low palaeolatitudes during the Ordovician (mainly Baltica, Laurentia, and Chinese palaeoblocks).
Martina Aubrechtová +2 more
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Late Ordovician Palynomorphs [PDF]
Journal of Micropalaeontology, 1985 Abstract. ACRITARCHSOrdovician acritarchs have been recorded in five core samples collected between 2520 ft. and 3000 ft. in Well E1-81, and ten cutting samples taken between 12150 ft. and 13240 ft. in Well J1-81A. All the assemblages recovered are of Late Ordovician age; no Early Ordovician or Middle Ordovician assemblages have been identified ...
Molyneux, S. G., Paris, F.
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New Late Ordovician cornulitids from Peru [PDF]
Bulletin of Geosciences, 2016 Two new species of cornulitids, Cornulites zatoni sp. nov. and Cornulites vilcae sp. nov., are described from the lower part (Sandbian) of the Calapuja Formation of south-western Peru. Late Ordovician cornulitid diversities of Peru (Gondwana) and Estonia (Baltica) are similar.
Vinn, Olev, Gutiérrez-Marco, J. C.
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Scientific Reports, 2022 The Early Ordovician is a key interval for our understanding of the evolution of life on Earth as it lays at the transition between the Cambrian Explosion and the Ordovician Radiation and because the fossil record of the late Cambrian is scarce.
Farid Saleh +12 more
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Was there more space in the late Early Devonian for marine biodiversity to peak than in the early Late Ordovician?: A brief note [PDF]
Geološki Anali Balkanskoga Poluostrva, 2013 After the so-called “Cambrian explosion”, marine biodiversity peaked either in the early Late Ordovician (as shown by the “classical” curves based on the extensive palaeontological data compilation) or in the late Early Devonian (as shown by the
Ruban Dmitry A.
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