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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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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The С–О–Sr–S Isotope Geochemistry and Chemostratigraphic Correlation of Ordovician Deposits in the Vilyui Structural-Facies Zone, Siberian Platform
Journal ArticleDOI
Relatively deep subtidal microbial–lithistid sponge reef communities in Lower Ordovician rocks reveal early escalation of the Great Ordovician Biodiversification Event
TL;DR: In this paper , the authors analyzed the constructional style and environmental conditions of middle-Tremadocian patch reefs in the middle Dumugol Formation of Korea, and assessed the temporal-spatial patterns of Furongian-Lower Ordovician reefs, to obtain a better insight into the transition of reef development during the EarlyOrdovician.
A high-resolution, continuous 13 C record spanning the
Alain Mauviel,André Desrochers +1 more
TL;DR: In this paper, a new high-resolution 13C curve with more than 500 data points spaced at every 0.5 m has been produced, rectifying important pitfalls of previously published 13C curves (i.e., low sampling resolution, variable sampling intervals, stratigraphic gaps).
Journal ArticleDOI
Ordovician Biostratigraphy - Index Fossils, Biozones, and Correlation
TL;DR: In this paper , the major subdivisions of the Ordovician system, their Global Stratotype Section and Points, and the chronostratigraphic levels that define their bases are reviewed.
Journal ArticleDOI
A review of the Late Ordovician (Katian) Richmondian Invasion of eastern Laurentia
TL;DR: A review of the current state of knowledge of the Richmondian invasion is presented in this article , where some of the key implications for understanding both Ordovician diversification and other intervals of Earth history are examined.
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.