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
The contribution of fossils to chronostratigraphy, 150 years after Albert Oppel
TL;DR: The 150th anniversary of the death of Albert Oppel (1831-65) provided the opportunity to celebrate this outstanding stratigrapher with a Thematic Issue dedicated to the importance of fossils for dating and correlating of sedimentary rocks as mentioned in this paper.
Journal ArticleDOI
Gastropods and tergomyans from the Upper Ordovician (Viru–Harju) of the Fågelsång area, Scania, southern Sweden
TL;DR: A diverse tergomyan and gastropod assemblage was described from the Global Boundary Stratotype Section and Point (GSSP)section of the Sandbian Stage, Upper Ordovician, in the Fagelsang area, Scania, Sweden as mentioned in this paper.
Mação-Penhascoso laccolite granite: age and its implications (SW- Central-Iberia Zone) O lacólito granítico de Mação-Penhascoso: idade e as suas implicações (SW da Zona Centro-Ibérica)
TL;DR: In this paper, a U/Pb (ID-TIMS) age of "ca 483 Ma" was obtained from magmatic zircon of the main microgranite lithofacies.
Sequence Stratigraphy, Chemostratigraphy, and Biostratigraphy of Lower Ordovician units in Northeastern and Western Central Utah: Regional Implications
TL;DR: Sequence Stratigraphy, Chemostratigraphy and Biostratigraphies of Lower Ordovician units in Northeastern and Western Central Utah: Regional Implications as mentioned in this paper.
Journal ArticleDOI
Oceanic environment changes caused the Late Ordovician extinction: evidence from geochemical and Nd isotopic composition in the Yangtze area, South China
TL;DR: In this paper, the Nd isotopic compositions in the Yangtze Sea are controlled by two sources: the continental erosion and the Panthalassa Ocean, which resulted in less terrestrial input based on the low Ti/Al and Zr/Al ratios.
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.