Results 41 to 50 of about 893 (201)

The first record of Hirnantian Ostracoda in South America: Implications for the biostratigraphy and paleozoogeography of the Paraná basin

, 2021
Herein is reported the first occurrence of ostracodes from the Iapó Formation, an uppermost Ordovician unit of the Rio Ivaí Group in the Paraná basin, Brazil.
Do Carmo, Dermeval Aparecido, Adôrno, Rodrigo Rodrigues, Rodrigues Adôrno, Rodrigo, Meidla, Tõnu, Salas, Maria Jose, Assine, Mario Luis, Assine, Mario Luis [UNESP], Antonietto, Lucas Silveira, Rodrigues, Lívia Cardoso Da Silva, Gonçalves, Lívio Reily De Oliveira, Denezine, Matheus   +10 more
core   +1 more source

Hirnantian (latest Ordovician) bio- and chemostratigraphy of the Stirnas-18 core, western Latvia [PDF]

Estonian Journal of Earth Sciences, 2010
Integrated study of the uppermost Ordovician Porkuni Stage in the Stirnas-18 core, western Latvia, has revealed one of the most complete Hirnantian successions in the eastern Baltic region.
Hints, Linda, Hints, Olle, Kaljo, Dimitri, Kiipli, Tarmo, Männik, Peep, Nõlvak, Jaak, Pärnaste, Helje   +6 more
doaj  

Trans-Atlantic application of the Baltic Middle and Upper Ordovician carbon isotope zonation [PDF]

Estonian Journal of Earth Sciences, 2015
Application of the recently introduced Baltic d13C isotope zonation to a composite North American Darriwilian through Hirnantian succession shows that in most intervals there is good trans-Atlantic agreement not only between the isotope zones but also ...
Stig M. Bergström, Matthew R. Saltzman, Stephen A. Leslie, Annalisa Ferretti, Seth A. Young   +4 more
doaj   +1 more source

Dynamic sulfur and carbon cycles related to microbial sulfate reduction and volcanic activity during the Hirnantian glaciation in the Upper Yangtze Basin, South China

Frontiers in Earth Science, 2022
Parallel positive excursions of organic carbon (δ13Corg) and pyrite sulfur (δ34Spy) isotopes occurred globally during the Hirnantian glacial period. However, the reasons for these isotope excursions and their relationship with paleoenvironmental dynamics
Zaitian Dong, Zetang Wang, Wenli Zhang, Fei Zhao, Yunhang Du, Yuxuan Zhu, Xuehai Fu, Chaoyong Wang   +7 more
doaj   +1 more source

The first Hirnantian (uppermost Ordovician) odontopleurid trilobite from Western Gondwana (Argentina) [PDF]

REVISTA BRASILEIRA DE PALEONTOLOGIA, 2014
An odontopleurid trilobite remain is described for the fi rst time from Hirnantian (uppermost Ordovician) rocks of Western Gondwana. Very rare material, represented by a single left librigena, comes from a new fossil locality of the Don Braulio Formation in the Eastern Argentine Precordillera.
Halpern, Karen, Rustán, Juan José, Meroi Arcerito, Facundo René   +2 more
openaire   +2 more sources

Carbon isotope chemostratigraphy and sea-level history of the Hirnantian Stage (uppermost Ordovician) in the Oslo-Asker district, Norway

, 2021
We present a 13Ccarb chemostratigraphy for the Late Ordovician Hirnantian Stage based on 208 whole-rock samples from six outcrops in the Oslo-Asker district, southern Norway.
Lehnert, Oliver,, Lehnert, Oliver, Bockelie, Johan Fredrik, Calner, Mikael, Joachimski, Michael M.,, Joachimski, Michael M., Rasmussen, Christian M. Ø., Calner, Mikael,, Calner, Hanna,, Rasmussen, Christian M.Ø., Calner, Hanna, Rasmussen, Christian M.Ø.,, Lund University.   +12 more
core   +1 more source

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

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

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