Reconstruction of the mid-Hirnantian palaeotopography in the Upper Yangtze region, South China [PDF]
Estonian Journal of Earth Sciences, 2014 Reconstruction of the Hirnantian (Late Ordovician) palaeotopography in South China is important for understanding the distribution pattern of the Hirnantian marine depositional environment.
Linna Zhang +3 more
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A diverse Hirnantian scolecodont assemblage from northern Estonia and resilience of polychaetes to the end-Ordovician mass extinction [PDF]
Estonian Journal of Earth Sciences, 2023 We report the discovery of a rich assemblage of latest Katian and Hirnantian scolecodonts (polychaete jaws) from a new OrdovicianâSilurian boundary outcrop in the Reinu quarry, northern Estonia.
Olle Hints, Petra Tonarová
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Литосфера, 2018 The results of lithological and geochemical study of the Hirnantian deposits on the western slope of the Subpolar (Ko-BKB and Ko-108/01 sections) and Northern (BK-2 section) Urals are presented.
Anna I. Antoshkina +1 more
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An earth system approach to understanding the end-Ordovician (Hirnantian) mass extinction [PDF]
, 2014 The Hirnantian mass extinction is recognized as the first of the "big three" extinctions and, along with the end-Permian and end-Cretaceous events, is the result of an acceleration in biotic extinctions concomitant with a rise in originations. The Hirnantian mass extinction is characterized by high taxonomic impact and within-community extinctions ...
Armstrong, H. A., Harper, D.A.T.
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, 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 +6 more
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Global climate stabilisation by chemical weathering during the Hirnantian glaciation [PDF]
Geochemical Perspectives Letters, 2017 Chemical weathering of silicate rocks is a primary drawdown mechanism of atmospheric carbon dioxide. The processes that affect weathering are therefore central in controlling global climate. A temperature-controlled “weathering thermostat” has long been proposed in stabilising long-term climate, but without definitive evidence from the geologic record.
Lenton, TM +5 more
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The succession of Hirnantian events based on data from Baltica: brachiopods, chitinozoans, conodonts, and carbon isotopes [PDF]
Estonian Journal of Earth Sciences, 2008 The Hirnantian (late Ordovician) environment was complex and dynamic. Understanding the correct order of events and their precise correlation with a time scale are extremely important for the development of different kinds of environmental ...
Kaljo, Dimitri +3 more
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Subaerial speleothems and deep karst in central Sweden linked to Hirnantian glaciations [PDF]
Journal of the Geological Society, 2015 The limestones of the upper Katian Boda mud mounds (Ordovician) of the Siljan district in central Sweden are deeply fractured. The fissures were partly synsedimentary and are often lined with stromatolite-like crusts. These crusts thus far are the only known subaerial Ordovician speleothems.
Kröger, Björn +6 more
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New Hirnantian orthide brachiopods from the type section of the Porkuni Stage (Porkuni quarry, northeastern Estonia) [PDF]
Estonian Journal of Earth Sciences, 2012 Four new Hirnantian species of orthide brachiopods, Sigmelasma peepi, Mendacella aerinensis, Drabovia? minuta and Tyronella siugensis are described from the type section of the Porkuni Regional Stage in the Porkuni quarry, northeastern Estonia.
Linda Hints
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The regional stratotype section and point for the base of the Hirnantian Stage (the uppermost Ordovician) at Mirny Creek, Omulev Mountains, Northeast Russia [PDF]
Estonian Journal of Earth Sciences, 2008 A complete Hirnantian sequence comprising the Normalograptus extraordinarius and N. persculptus biozones is well developed at the Mirny Creek section in the Omulev Mountains.
Koren, Tatyana N. +1 more
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