Abrupt global-ocean anoxia during the Late Ordovician–early Silurian detected using uranium isotopes of marine carbonates [PDF]
Proceedings of the National Academy of Sciences of the United States of America, 2018 Maya Elrick +2 more
exaly +2 more sources
Global palaeogeographical implication of acritarchs in the Upper Ordovician [PDF]
Estonian Journal of Earth Sciences, 2023 The EarlyâMiddle Ordovician peri-Gondwana and Baltica acritarch provinces are easily recognizable, illustrating a clear provincialism of global phytoplankton.
Yan Kui +4 more
doaj +1 more source
The Irish Ordovician brachiopod fauna: A taxonomic renaissance [PDF]
Estonian Journal of Earth Sciences, 2023 Despite its small areal extent, the island of Ireland exposes eight Caledonian tectonic terranes; six of them contain Ordovician brachiopod assemblages. These terranes record the early phases and destruction of the Iapetus Ocean through the occurrence of
David A. T. Harper
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
Putative Late Ordovician land plants [PDF]
New Phytologist, 2018 The colonization of early terrestrial ecosystems by embryophytes (i.e. land plants) irreversibly changed global biogeochemical cycles (Berner & Kothavala, 2001; Berner et al., 2007; Song et al., 2012). However, when and how the process of plant terrestrialization took place is still intensely debated (Kenrick & Crane, 1997; Kenrick et al., 2012 ...
Salamon, Mariusz +11 more
openaire +4 more sources
Late Ordovician Mass Extinction: Earth, fire and ice. [PDF]
Natl Sci Rev, 2023 ABSTRACT The Late Ordovician Mass Extinction was the earliest of the ‘big’ five extinction events and the earliest to affect the trajectory of metazoan life. Two phases have been identified near the start of the Hirnantian period and in the middle.
Harper DAT.
europepmc +3 more sources
The Late Ordovician glacial record
, 2008 An outline of the North Gondwanan, Late Ordovician glacial record is proposed. The related palaeogeographic domain extended from southern high palaeo-latitudes (southeastern Mauritania, Niger) to northern lower palaeo-latitudes (Morocco, Turkey, Sardinia) and covered a more than 4000 km-wide section perpendicular to ice-flow lines. Glacial advances are
Ghienne, Jean-François +3 more
openaire +3 more sources