Results 131 to 140 of about 276 (173)
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Hirnantian sea-level changes in the Baltoscandian Basin, a review
Palaeogeography, Palaeoclimatology, Palaeoecology, 2020Abstract Correlation of Hirnantian sections of the Baltoscandian Basin reveals four major transgressive-regressive sea-level cycles related to waxing and waning of ice sheets at high Southern Hemisphere paleolatitudes. The correlation between stratigraphic members in Estonia and Latvia shows transgressions-regressions in the first half of the ...
Tarmo Kiipli, Enli Kiipli
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Tracking the Hirnantian glaciation using Os isotopes
Earth and Planetary Science Letters, 2010article i nfo Article history: Here we present initial 187 Os/ 188 Os (Osi) values integrated with δ 13 Corg for the first Paleozoic section — the Ordovician/Silurian boundary GSSP at Dob's Linn, Scotland. Our 187 Os/ 188 Os data tracks major changes in climate that occurred during the Late Ordovician (Hirnantian glaciation), which coincides with the ...
Alexander Finlay +2 more
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Taphonomy of exceptional sponge preservation in the Hirnantian Anji Biota, China
Journal of the Geological Society, 2022The Anji Biota is a unique deposit with exceptionally preserved sponges and other organisms in deep-water, uppermost Ordovician mudstone of Zhejiang Province, China. The sponge fossils preserve remarkable details including carbonaceous preservation of soft tissues and axial filaments of spicules, but the taphonomy of the deposit has not previously been
Xuejin Wu +4 more
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Decreased marine organic carbon burial during the Hirnantian glaciation
Earth and Planetary Science LettersJunxuan Fan, Shengchao Yang
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A global synthesis of the latest Ordovician Hirnantian brachiopod faunas
Transactions of the Royal Society of Edinburgh: Earth Sciences, 1988ABSTRACTA global review of new and existing data on the distribution of uppermost Ordovician (Hirnantian) brachiopods indicates the existence of at least three biogeographically distinct faunas. The typical Hirnantia fauna characterised subtropical and temperate latitudes and comprised a variety of ecological associations; the fauna reached its acme ...
Rong Jia-yu, David A. T. Harper
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Environmental changes in the Hirnantian (upper Ordovician) of the Prague Basin, Czechoslovakia
Geological Journal, 1989AbstractSedimentary sequences through the uppermost Ordovician (Hirnantian), Kosov Formation, are described. The Kosov Formation is a shale‐dominated formation with two thin horizons of sandy diamictites near the base and two ‘flysch’ units separated by shales forming the main part of the formation, which is overlain abruptly by Silurian graptolitic ...
P. J. Brenchley, P. Štorch
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Pre‐Hirnantian Ashgill climatically warm event in the Mediterranean region
Lethaia, 2003Compilation of the marine, benthic megafossils from approximately the mid-Ashgill of the Mediterranean region, including much of Central and Southern Europe plus North Africa, and elsewhere indicates a warm interval featuring bioclastic limestone and a warm climate marine fauna.
A.J Boucot +3 more
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Circular, Cryogenic Structures from the Hirnantian Deglaciation Sequence (Anti-Atlas, Morocco)
Journal of Sedimentary Research, 2013Abstract: More than a hundred circular structures are observed at the topmost part of the Late Ordovician glaciogenic record in the central Anti-Atlas, southern Morocco. The structures were formed in the outer glaciated platform and characterize the Hirnantian deglaciation sequence. They are distributed within a 20 meter thick stratal
Nutz, Alexis +2 more
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The Hirnantian glacial landsystem of the Sahara: a meltwater-dominated system
Geological Society, London, Memoirs, 2016During the Hirnantian (443 Ma), ice sheets expanded towards the present-day north over North Africa and the Arabian Peninsula when the western part of the Gondwana supercontinent straddled the South Pole. A glacigenic succession is exposed around the flanks of several Saharan cratonic basins, including Murzuq and Al Kufrah basins in Libya.
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The Hirnantian δ13C Positive Excursion in the Nabiullino Section (South Urals)
Doklady Earth Sciences, 2018The upper Sandbian, Katian, and Hirnantian complexes of conodonts in the upper Ordovician section of the western slope of the Southern Urals near the village of Nabiullino were studied. The δ13C positive excursion with a maximum of 3.3‰ associated with the global Hirnantian isotopic event, HICE, was fixed for the first time.
R. R. Yakupov +2 more
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