Journal ArticleDOI
The new chronostratigraphic classification of the Ordovician System and its relations to major regional series and stages and to δ13C chemostratigraphy
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TLDR
In this paper, a new global classification of the Ordovician System into three series and seven stages has been proposed, based on a variety of biostratigraphic data.Abstract:
The extensive work carried out during more than a decade by the International Subcommission on Ordovician Stratigraphy has resulted in a new global classification of the Ordovician System into three series and seven stages. Formal Global Boundary Stratotype Section and Points (GSSPs) for all stages have been selected and these and the new stage names have been ratified by the International Commission on Stratigraphy. Based on a variety of biostratigraphic data, these new units are correlated with chronostratigraphic series and stages in the standard regional classifications used in the UK, North America, Baltoscandia, Australia, China, Siberia and the Mediterranean-North Gondwana region. Furthermore, based mainly on graptolite and conodont zones, the Ordovician is subdivided into 20 stage slices (SS) that have potential for precise correlations in both carbonate and shale facies. The new chronostratigraphic scheme is also tied to a new composite δ13C curve through the entire Ordovician.read more
Citations
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Journal ArticleDOI
Chitinozoan biostratigraphy and carbon isotope stratigraphy from the Upper Ordovician Skogerholmen Formation in the Oslo Region. A new perspective for the Hirnantian lower boundary in Baltica
Chloé E. A. Amberg,Thijs R.A. Vandenbroucke,Thijs R.A. Vandenbroucke,Arne Thorshøj Nielsen,Axel Munnecke,Patrick I. McLaughlin +5 more
TL;DR: In this paper, the authors used stable carbon isotope stratigraphy in combination with chitinozoan biostratigraphy to correlate the Upper Ordovician Belonechitina gamachiana biozone with the lower-middle Pirgu Baltic Stage.
Dissertation
Mineral eyes : lessons from the natural world
TL;DR: In this article, a detailed analysis of the microstructure and chemistry of trilobite compound eyes has been carried out using Code V optical modeling software, leading to the conclusions that the original structures of schizochroal lenses were originally constructed as doublets, as suggested by Clarkson and Levi-Setti, and were not gradient index lenses, as was suggested by Campbell and Bruton and Haas.
Journal ArticleDOI
The new Ordovician stage standard as applied to the stratigraphic units of the western Altai-Sayan Folded Area
TL;DR: In this paper, the position of the boundaries of most of the Ordovician formations showing a wide lateral distribution in southern Siberia has been described in detail in terms of the new stage standard of the General Stratigraphic Scale of Russia.
Journal ArticleDOI
The δ13C chemostratigraphy of Ordovician global stage stratotypes: geochemical data from the Floian and Sandbian GSSPs in Sweden
TL;DR: In this article, the δ13C chemostratigraphy of five of the seven Ordovician global stages has been published previously but no such data have been available from the Floian GSSP and most of the Sandbian GSSP in Swe...
References
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Journal ArticleDOI
Long-lived glaciation in the Late Ordovician? Isotopic and sequence-stratigraphic evidence from western Laurentia
TL;DR: In this article, an integrated δ13C and sequence stratigraphic analysis in Nevada is presented, showing that in the Late Ordovician Chatfieldian Stage (mid-Caradoc) a positive δ 13C excursion in the upper part of the Copenhagen Formation was closely followed by a regressive event evidenced within the prominent Eureka Quartzite.
Book ChapterDOI
The Ordovician Period
Roger A. Cooper,Peter M. Sadler +1 more
TL;DR: A prolonged "hot-house" climate through Early Ordovician, cooling through Middle Ordovian and changing to ''ice-house'' conditions in Late Ordovicians, global glaciation, oceanic turnover and mass extinction at end of period, strong fluctuations in eustatic sea level, appearance and diversification of pandemic planktonic graptolites and conodonts important for correlation, moderate to strong benthic faunal provincialism, re-organization and rapid migration of tectonic plates surrounding the Iapetus Ocean and migration of
Journal ArticleDOI
The Ordovician chitinozoan biozones of the Northern Gondwana Domain
TL;DR: In this paper, a formal biozonation for the Ordovician chitinozoans of the Northern Gondwana Domain is proposed based on the study of several thousand assemblages recovered from closely spaced samples (both outcrop and subsurface material).
Journal ArticleDOI
Late Ordovician global warming—The Boda event
TL;DR: There is substantial evidence for mid-Ashgillian global warming before the latest Ordovician Hirnantian glaciation, as shown by the movement of previously lower latitude benthic faunas such as trilobites and brachiopods to progressively higher latitudes and by an increase in endemic taxa at low latitudes.