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
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Journal ArticleDOI
Phylogenetic Implications of the Oldest Crinoids
TL;DR: Character compilation and phylogenetic analysis posit early class-level plesiomorphies inherited from an unknown ancestry but lost during subsequent crinoid evolution, which are generally robust and consistent with earlier subdivisions of the class, but supporting lower rank reorganizations.
Journal ArticleDOI
Biogeography of Ordovician linguliform and craniiform brachiopods
TL;DR: The biogeographical patterns shown by Ordovician linguliform and craniiform brachiopods are greatly influenced by their dominance in low-diversity associations in marginal environments as discussed by the authors.
Journal ArticleDOI
Reconstructing the environmental conditions around the Silurian Ireviken Event using the carbon isotope composition of bulk and palynomorph organic matter
Thijs R.A. Vandenbroucke,Thijs R.A. Vandenbroucke,Axel Munnecke,Melanie J. Leng,Melanie J. Leng,Torsten Bickert,Olle Hints,David Gelsthorpe,Georg Maier,Thomas Servais +9 more
TL;DR: The carbon isotope composition (δ13C) of bulk organic matter and two palynomorph groups (scolecodonts and chitinozoans) from the Llandovery-Wenlock strata of Gotland (E Sweden) are compared to gain knowledge about carbon cycling in the Silurian (sub)tropical shelf environment as mentioned in this paper.
Journal ArticleDOI
First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages
Thomas Servais,Stewart G. Molyneux,Jun Li,Hendrik Nowak,Claudia V. Rubinstein,Marco Vecoli,Wenhui Wang,Kui Yan +7 more
TL;DR: In this article, the first appearance data (FADs) of selected, easily recognizable acritarch morphotypes are assessed to determine their potential contribution to correlation between Lower and Middle Ordovician stages and substage divisions along the Gondwanan margin (Perigondwana) and between PerigONDwana and other palaeocontinents.
Journal ArticleDOI
Changes in the latitudinal diversity gradient during the Great Ordovician Biodiversification Event
TL;DR: Jablonski et al. as mentioned in this paper analyzed Ordovician marine diversity across 43 paleolatitudinal zones based on Cambrian-Silurian fossil occurrences documented in the Paleobiology Database (Paleobiodb.org).
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.