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Author

Carlo Corradini

Other affiliations: University of Cagliari
Bio: Carlo Corradini is an academic researcher from University of Trieste. The author has contributed to research in topics: Devonian & Conodont. The author has an hindex of 17, co-authored 119 publications receiving 1172 citations. Previous affiliations of Carlo Corradini include University of Cagliari.


Papers
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Journal ArticleDOI
01 Jun 2011-Lethaia
TL;DR: In this article, an update of the progress on recalibrating the global chronostratigraphic correlation of North American Provincial Series and Stage boundaries in their type area is presented.
Abstract: Recent revisions to the biostratigraphic and chronostratigraphic assignment of strata from the type area of the Niagaran Provincial Series (a regional chronostratigraphic unit) have demonstrated the need to revise the chronostratigraphic correlation of the Silurian System of North America. Recently, the working group to restudy the base of the Wenlock Series has developed an extremely high-resolution global chronostratigraphy for the Telychian and Sheinwoodian stages by integrating graptolite and conodont biostratigraphy with carbonate carbon isotope (delta 13C(carb)) chemostratigraphy. This improved global chronostratigraphy has required such significant chronostratigraphic revisions to the North American succession that much of the Silurian System in North America is currently in a state of flux and needs further refinement. This report serves as an update of the progress on recalibrating the global chronostratigraphic correlation of North American Provincial Series and Stage boundaries in their type area. The revised North American classification is correlated with global series and stages as well as regional classifications used in the United Kingdom, the East Baltic, Australia, China, the Barrandian, and Altaj. Twenty-four potential stage slices, based primarily on graptolite and conodont zones and correlated to the global series and stages, are illustrated alongside a new composite delta 13C(carb) curve for the Silurian. Conodont, graptolite, isotope, New York, Ontario, series, Silurian, stage. (Less)

199 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a new criterion for the definition of the base of the Carboniferous system based on the First Appearance Datum of Pr. kockeli or Si. bransoni.
Abstract: This paper is a contribution to the redefinition of the base of Carboniferous system. At present the criterion for the definition of the Devonian–Carboniferous boundary is the first occurrence of a conodont species. In order to evaluate the stratigraphic potential for new criteria for the definition of the Devonian–Carboniferous boundary, the distribution of conodont species of Bispathodus, Branmehla, Palmatolepis, Polygnathus, Protognathodus, Pseudopolygnathus and Siphonodella across the boundary is presented and discussed. An updated biozonation scheme across the boundary based on the First Appearance of Bispathodus ac. aculeatus, Bispathodus costatus, Bispathodus ultimus, Protognathodus kockeli, Siphonodella bransoni and Siphonodella duplicata is proposed, and it is suggested that the new criterion for the definition of the base of the Carboniferous system be the First Appearance Datum of Pr. kockeli or Si. bransoni .

59 citations

Journal ArticleDOI
TL;DR: In this article, a taxonomic analysis of early siphonodellids from the GSSP La Serre (Montagne Noire, France) is presented, where morphotypes of Siphonodella sulcata and S. praesulcata are compared.
Abstract: Previous conodont studies on the Devonian/Carboniferous (D/C) boundary revealed that the current definition of the D/C boundary cannot be maintained due to several problems relating to the index taxon. The base of the Carboniferous System is defined by the first occurrence of the cono- dont species Siphonodella sulcata, within the S. praesulcata - S. sulcata lineage. However, problems in discriminating S. praesulcata from S. sulcata have been evidenced by the conodont studies of a variety of authors. To provide an overview about the early siphonodellids and the taxonomic state, conodonts from the current GSSP La Serre (Montagne Noire, France), as well as all data from the literature were taken into account. Based on these data, several morphotypes could be distinguished, although the great majority of specimens show intermediate features between the two taxa. There- fore, precise identification of such specimens is very much dependent on personal interpretation, thus strongly influencing the precise position of the D/C boundary which, as a result, is not synchronous. Alternative scenarios for the definition of the D/C boundary need to be considered in the future.

55 citations


Cited by
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Journal ArticleDOI
TL;DR: The authors reviewed the relationships of the three major biotic events to chemical and physical processes occurring in the ocean and atmosphere during the Ordovician and Silurian, including sea-level changes, geochemical proxies (δ13C, δ18O, 87Sr/86Sr) of the ocean waters, and the evolution of the atmosphere (oxygen and carbon dioxide content).

315 citations

Book ChapterDOI
01 Jan 2012
TL;DR: Only the GSSPs for the Bashkirian, Visean and Tournaisian (base of the Mississippian) have been formalized, although the latter now has complications as mentioned in this paper.
Abstract: Only the GSSPs for the Bashkirian (base of the Pennsylvanian), Visean and Tournaisian (base of the Mississippian) have been formalized, although the latter now has complications.

229 citations

Journal ArticleDOI
TL;DR: In this paper, Nitrogen isotope data show that the regions of oceanic anoxia were marked by intense water column denitrification in which cyanobacteria were the principal source of fixed N.
Abstract: The Late Ordovician (Katian-Hirnantian) through earliest Silurian (Rhuddanian) interval was a time of varying climate and sea level, marked by a peak glacial episode in the early-mid-Hirnantian. Synthesis of recently published data permits global correlation of at least two cycles of glacial advance and retreat with a distinct interglacial period that is recognizable in sequence-stratigraphic and chemostratigraphic records in many parts of the world. A period of warming and sea-level rise during the late Katian is marked by the widespread occurrences of oceanic anoxia in paleotropical and subtropical localities, mostly confined to regions of inferred upwelling and semirestricted marine basins. Nitrogen isotope data show that the regions of oceanic anoxia were marked by intense water-column denitrification in which cyanobacteria were the principal source of fixed N. In the overlying peak glacial interval of the Hirnantian, sedimentary successions from localities representing a wide range of water depths and paleolatitudes indicate that anoxia was restricted during the early-mid-Hirnantian. The shift to more positive N isotope values also suggests less intense water-column denitrification. In the overlying late Hirnantian and early Rhuddanian, the distribution of black shales reaches its greatest extent in the studied interval. Localities showing evidence of anoxia are globally spread over all paleolatitudes and water depths for which data are available, indicating a Rhuddanian ocean anoxic event comparable to examples from the Mesozoic. It is accompanied by a return to intensely denitrifying conditions within the water column, as indicated by the shift to negative N isotope values. The two phases of Hirnantian mass extinction coincide with rapid, climate-driven changes in oceanic anoxia. The first extinction occurred at the onset of glaciation and with the loss of anoxic conditions at the end of the Katian. The second extinction occurred at the demise of glaciation and coincided with the return of anoxic conditions during the late Hirnantian–early Rhuddanian. Integration of our N isotope data with graptolite biodiversity records suggests that the extinctions were profoundly influenced by changes occurring at the base of the marine food web, i.e., redox-driven changes in nutrient cycling and primary producer communities.

223 citations

Journal ArticleDOI
01 Jun 2011-Lethaia
TL;DR: In this article, an update of the progress on recalibrating the global chronostratigraphic correlation of North American Provincial Series and Stage boundaries in their type area is presented.
Abstract: Recent revisions to the biostratigraphic and chronostratigraphic assignment of strata from the type area of the Niagaran Provincial Series (a regional chronostratigraphic unit) have demonstrated the need to revise the chronostratigraphic correlation of the Silurian System of North America. Recently, the working group to restudy the base of the Wenlock Series has developed an extremely high-resolution global chronostratigraphy for the Telychian and Sheinwoodian stages by integrating graptolite and conodont biostratigraphy with carbonate carbon isotope (delta 13C(carb)) chemostratigraphy. This improved global chronostratigraphy has required such significant chronostratigraphic revisions to the North American succession that much of the Silurian System in North America is currently in a state of flux and needs further refinement. This report serves as an update of the progress on recalibrating the global chronostratigraphic correlation of North American Provincial Series and Stage boundaries in their type area. The revised North American classification is correlated with global series and stages as well as regional classifications used in the United Kingdom, the East Baltic, Australia, China, the Barrandian, and Altaj. Twenty-four potential stage slices, based primarily on graptolite and conodont zones and correlated to the global series and stages, are illustrated alongside a new composite delta 13C(carb) curve for the Silurian. Conodont, graptolite, isotope, New York, Ontario, series, Silurian, stage. (Less)

199 citations