The latest Ordovician Hirnantian brachiopod faunas: New global insights [PDF]
Earth-Science Reviews, 2020 Abstract The temporal and spatial distribution of Hirnantian brachiopod faunas are reviewed based on a new, comprehensive dataset from over 20 palaeoplates and terranes, a revised correlation scheme for Hirnantian strata and numerical methods including network analysis. There were two successive evolutionary faunas: 1.
Jiayu Rong, David A T Harper
exaly +11 more sources
Hirnantian Isotope Carbon Excursion in Gorny Altai, southwestern Siberia [PDF]
Estonian Journal of Earth Sciences, 2015 The Hirnantian Isotope Carbon Excursion (HICE), a glaciation-induced positive δ13C shift in the end-Ordovician successions, has been widely used in chemostratigraphic correlation of the Ordovician–Silurian boundary beds in many areas of the world ...
Nikolay V. Sennikov +2 more
doaj +3 more sources
Chitinozoan biozonation in the upper Katian and Hirnantian of the Welsh Basin, UK [PDF]
Review of Palaeobotany and Palynology, 2014 AbstractHere we present a chitinozoan biostratigraphical framework for the South Wales upper Katian and Hirnantian (Ashgill) succession. The current study indicates that three of the six Avalonian Ashgill chitinozoan biozones are recognised in the Welsh Basin; the bergstroemi, fossensis and umbilicata biozones.
Thijs R A Vandenbroucke
exaly +3 more sources
Different controls on the Hg spikes linked the two pulses of the Late Ordovician mass extinction in South China [PDF]
Scientific Reports, 2022 The Late Ordovician mass extinction (LOME, ca. 445 Ma; Hirnantian stage) is the second most severe biological crisis of the entire Phanerozoic. The LOME has been subdivided into two pulses (intervals), at the beginning and the ending of the Hirnantian ...
Zhen Qiu +5 more
doaj +2 more sources
End-Ordovician ostracod faunal dynamics in the Baltic Palaeobasin [PDF]
Estonian Journal of Earth Sciences, 2021 The Late Ordovician Baltic Palaeobasin (BPB) offered a favourable environment for a diverse and abundant ostracod fauna to thrive across the basin.
Karin Truuver, Tõnu Meidla, Oive Tinn
doaj +3 more sources
AGU Advances, 2022 The Ordovician (Hirnantian; 445 Ma) hosts the second most severe mass extinction in Earth history, coinciding with Gondwanan glaciation and increased geochemical evidence for marine anoxia.
Nevin P. Kozik +4 more
doaj +2 more sources
Changes in palaeoclimate and palaeoenvironment in the Upper Yangtze area (South China) during the Ordovician–Silurian transition [PDF]
Scientific Reports, 2022 The Ordovician–Silurian transition was a critical period in geological history, during which profound changes in climatic, biotic, and oceanic conditions occurred.
Xin Men, Chuanlong Mou, Xiangying Ge
doaj +2 more sources
Volcanism and basalt weathering drove Ordovician climatic cooling [PDF]
Nature CommunicationsCausal connections among major Ordovician environmental and biological events (i.e., long-term climatic cooling, Hirnantian Glaciation, Great Ordovician Biodiversification Event, and Late Ordovician Mass Extinction) remain in debate, and the hypothesis ...
He Zhao +5 more
doaj +2 more sources
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
doaj +2 more sources
Geophysical Monograph Series, Page 169-190., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Nasrrddine Youbi +9 more
wiley +3 more sources