Results 51 to 60 of about 1,764 (217)

An extremely brief end Ordovician mass extinction linked to abrupt onset of glaciation

Solid Earth Sciences, 2019
The end Ordovician mass extinction (EOME) was the second most severe biotic crisis in Phanerozoic, and has been widely linked to a major glaciation. However, robust geochronology of this interval is still lacking.
Ming-Xing Ling, Ren-Bin Zhan, Guang-Xu Wang, Yi Wang, Yuri Amelin, Peng Tang, Jian-Bo Liu, Jisuo Jin, Bing Huang, Rong-Chang Wu, Shuo Xue, Bin Fu, Vickie C. Bennett, Xin Wei, Xiao-Cong Luan, Seth Finnegan, David A.T. Harper, Jia-Yu Rong   +17 more
doaj   +1 more source

A multiproxy study of the Puhmu core section (Estonia, Upper Ordovician): consequences for stratigraphy and environmental interpretation [PDF]

Estonian Journal of Earth Sciences, 2017
A multiproxy study of the Katian and Hirnantian in the Puhmu core in NE Estonia resulted in new data on chitinozoan and brachiopod biostratigraphy. Some mass occurrences of dasycladacean algae are tied to small early Katian ‘reefs’.
Dimitri Kaljo, Linda Hints, Tõnu Martma, Jaak Nõlvak   +3 more
doaj   +1 more source

The Location and Styles of Ice-Free “Oases” during Neoproterozoic Glaciations with Evolutionary Implications [PDF]

, 2012
Evidence based on molecular clocks, together with molecular evidence/biomarkers and putative body fossils, points to major evolutionary events prior to and during the intense Cryogenian and Ediacaran glaciations. The glaciations themselves were of global
Bailey, Bell, Bowring, Brenchley, Butterfield, Butterfield, Chen, Chen, Craig, Dalziel, Etienne, Garrison, Grey, Grotzinger, Guo, Hagadorn, Hoffman, Hoffman, Huldtgren, Karl, Kirschvink, Love, Macdonald, Mann, Mawson, Meert, Scotese, Sprigg, Staley, Summons, Sutcliffe, Waggoner   +31 more
core   +1 more source

Conodonts in Ordovician biostratigraphy [PDF]

, 2017
The long time interval after Pander's (1856) original conodont study can in terms of Ordovician conodont biostratigraphical research be subdivided into three periods, namely the Pioneer Period (1856-1955), the Transition Period (1955-1971) and the Modern
Abaimova, Agematsu, Agematsu, Albanesi, Amsden, An, An, An, An, Armstrong, Armstrong, Bagnoli, Balini, Bauer, Bauer, Bergström, Bergström, Bergström, Bergström, Bergström, Bergström, Bergström, Bergström, Bergström, Bergström, Bergström, Bergström, Bergström, Bergström, Bergström, Branson, Branson, Burrett, Cooper, Cullison, Del Moral, Druce, Druce, Dumoulin, Dzik, Dzik, Dzik, Ethington, Ethington, Feltes, Ferretti, Ferretti, Ferretti, Ferretti, Ferretti, Ferretti, Ferretti, Furnish, Graves, Harris, Hinde, Holm, Ji, Johnston, Knüpfer, Lapworth, Lehnert, Lehnert, Lindström, Lindström, Lindström, Löfgren, Löfgren, Löfgren, Löfgren, Löfgren, Löfgren, Löfgren, McCracken, McTavish, Miller, Miller, Miller, Moskalenko, Moskalenko, Männik, Ni, Nowlan, Orchard, Pander, Paris, Pohler, Pohler, Pyle, Pyle, Rasmussen, Rhodes, Rhodes, Sarmiento, Savage, Sennikov, Sergeeva, Serpagli, Serpagli, Serpagli, Serpagli, Serra, Smith, Smith, Smith, Stauffer, Stauffer, Stouge, Stouge, Stouge, Sweet, Sweet, Sweet, Sweet, Sweet, Sweet, Sweet, Sweet, Sweet, Tjernvik, Tjernvik, Tolmacheva, Tolmacheva, Tolmacheva, Viira, Viira, Viira, Voldman, Wang, Wang, Wang, Wang, Watson, Weyant, Wiman, Wiman, Young, Zhan, Zhang, Zhang, Zhang, Zhang, Zhao, Zhen, Zhen, Zhen, Zhen, Zhen, Álvaro   +148 more
core   +1 more source

Late Ordovician (Sandbian–Hirnantian) marine gastropods from the Argentine Precordillera: their biogeographical significance in a middle to high latitudinal setting [PDF]

Acta Palaeontologica Polonica
Gastropods from the Upper Ordovician of the Argentine Precordillera received less attention than other coeval marine invertebrates in this region. The present contribution supplies accurate taxonomic information recovering 10 gastropod genera which are ...
Mariel Ferrari, Verónica Bertero, Marcelo G. Carrera   +2 more
doaj   +1 more source

Global Series and Stages for the Ordovician System : a Progress Report [PDF]

, 2005
There is no global standard set of chronostratigraphic/geochronologic subdivisions for the Ordovician System/Period. British series/epochs are often used as de facto nomenclature on stratigraphic correlation charts and geologic time scales. However, they
Finney, S.
core   +3 more sources

Impact of Late Ordovician glaciation on trace fossil assemblages in Gondwana: a case study of the Serra Grande Group (Parnaíba Basin, NE Brazil)

Frontiers in Ecology and Evolution
The Hirnantian Ice Age had a significant impact on marine invertebrate biota at the end of the Ordovician due to drastic cooling and falling sea levels.
Sara C. Memória, Sara C. Memória, Renata G. Netto, Renata G. Netto, Renata G. Netto, Daniel Sedorko, Daniel Sedorko, Luiz Saturnino de Andrade, Luiz Saturnino de Andrade, Bernardo Vázquez-García   +9 more
doaj   +1 more source

The Hirnantian Stage and the Hirnantian Isotope Carbon Excursion (HICE) in the Gotland (Sweden) subsurface

, 2022
Summary. We provide a stratigraphic assessment of the Upper Ordovician through lowermost Silurian of theStora Sutarve drillcore from southernmost Gotland. Based on the combined information from lithological characteristics and carbon isotope chemostratigraphy we document a sedimentary succession tentatively ranging fromthe Kinnekulle K-bentonite near ...
Gunnarsson, Niklas, Calner, Mikael, Wu, Rongchang, Rasmussen, Christian M. Ø., Lehnert, Oliver, Erlström, Mikael, Dahlqvist, Peter   +6 more
openaire   +1 more source

Late Ordovician (Hirnantian) shelly fossils from New Zealand and their significance [PDF]

New Zealand Journal of Geology and Geophysics, 2004
Abstract A poorly preserved fauna of brachiopods, trilobites, corals, molluscs, bryozoans, echinoderms, and ostracods is described from Wangapeka Valley, northwest South Island. It can be dated to the latest Ordovician Hirnantian Stage, equivalent to Bolindian Bo4‐Bo5, by immediately underlying graptolite faunas ...
L. R. M. Cocks, Roger A. Cooper
openaire   +1 more source

Discovery of trimerellide brachiopod Gasconsia from the Ordovician of Estonia [PDF]

Estonian Journal of Earth Sciences
In this study, the first trimerellide brachiopods from Estonia are described. They occur in the uppermost Katian (Upper Ordovician) shallow shelf environments and represent some of the largest Ordovician brachiopods.
Linda Hints, Jiayu Rong
doaj   +1 more source