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
Structural stages and evolution of the Urals
TL;DR: In this article, five main structural and historical stages are established in the territory of the Urals: 1) Archean-Paleoproterozoic, a time of formation of the Volgo-Uralia subcontinent and its amalgamation with the other blocks of the craton of Baltica.
Journal ArticleDOI
Age calibration of the Lower Ordovician Fezouata Lagerstätte, Morocco
Bertrand Lefebvre,Juan Carlos Gutiérrez-Marco,Oliver Lehnert,Emmanuel L.O. Martin,Hendrik Nowak,Mustapha Akodad,Khadija El Hariri,Thomas Servais +7 more
TL;DR: In this article, all available biostratigraphical evidence based on several fossil groups is critically reviewed and discussed, concluding that exceptional preservation is restricted to a few thin, discontinuous, lens-shaped horizons occurring in two distinct parts of the Fezouata Shale: a lower interval (260-330m above the base of the formation) and an upper interval (570-620m).
Journal ArticleDOI
Graptolite-Trilobite Biostratigraphy in the Santa Victoria Area, Northwestern Argentina. A Key for Regional and Worldwide Correlation of the Lower Ordovician (Tremadocian—Floian)
Blanca A. Toro,Facundo René Meroi Arcerito,Diego F. Muñoz,Beatriz G. Waisfeld,G. Susana de la Puente +4 more
TL;DR: Aorograptus victoriae (T. A. S. Hall), together with Adelogratus cf. altus Williams and Stevens and Ancoragraptus bulmani (Spjeldnaes) are described for the first time in the Santa Victoria area as discussed by the authors.
Journal ArticleDOI
The base of the global Dapingian Stage (Ordovician) in Baltoscandia: conodonts, graptolites and unconformities
Stig M. Bergström,Anita Löfgren +1 more
TL;DR: In the recently completed and formally ratified new series and stage classification of the Ordovician System, the base of the MiddleOrdovician Series coincides with the global Dapingian Stage as mentioned in this paper.
Book ChapterDOI
Early Ordovician–Devonian Passive Margin Stage in the Gondwanan Units of the Iberian Massif
Juan Carlos Gutiérrez-Marco,J. M. Piçarra,Carlos Meireles,Pedro Cózar,Diego C. García-Bellido,Zélia Pereira,N. Vaz,N. Vaz,S. Pereira,Gilda Lopes,José Tomás Oliveira,Cecilio Quesada,Samuel Zamora,Jorge Esteve,Jorge Colmenar,Enrique Bernárdez,Ismael Coronado,Saturnino Lorenzo,Artur A. Sá,Artur A. Sá,Í. Dias da Silva,E. González-Clavijo,Alejandro Díez-Montes,Juan Gómez-Barreiro +23 more
TL;DR: The passive margin stage is characterized by development of open marine platform sedimentation locally punctuated by eruption/intrusion of mainly basaltic, alkaline volcanic rocks, during transient periods of tectonic extension as discussed by the authors.
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.