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Jeffrey D Over - One of the best experts on this subject based on the ideXlab platform.

  • conodonts across the devonian Carboniferous boundary a review and implication for the redefinition of the boundary and a proposal for an updated conodont zonation
    Geological Magazine, 2017
    Co-Authors: Carlo Corradini, Claudia Spalletta, Angelo Mossoni, Hanna Matyja, Jeffrey D Over
    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 .

Carlo Corradini - One of the best experts on this subject based on the ideXlab platform.

  • conodonts across the devonian Carboniferous boundary a review and implication for the redefinition of the boundary and a proposal for an updated conodont zonation
    Geological Magazine, 2017
    Co-Authors: Carlo Corradini, Claudia Spalletta, Angelo Mossoni, Hanna Matyja, Jeffrey D Over
    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 .

  • the early siphonodellids conodonta late devonian early Carboniferous overview and taxonomic state
    Neues Jahrbuch Fur Geologie Und Palaontologie-abhandlungen, 2011
    Co-Authors: Sandra I Kaiser, Carlo Corradini
    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.

Philip H Heckel - One of the best experts on this subject based on the ideXlab platform.

  • choice of conodont idiognathodus simulator sensu stricto as the event marker for the base of the global gzhelian stage upper pennsylvanian series Carboniferous System
    Episodes, 2008
    Co-Authors: Philip H Heckel, A S Alekseev, James E Barrick, Darwin R Boardman, N V Goreva, Tamara I Nemyrovska, Katsumi Ueno, Elisa Villa, T N Isakova, David M Work
    Abstract:

    We propose that the level at which the conodont species Idiognathodus simulator (Ellison 1941) (sensu stricto) first appears be selected to mark the base of the Gzhelian Stage, because we believe that this is the optimal level by which this boundary can be correlated. This taxon has a short range and a wide distribution, as shown by correlation of glacial-eustatic cyclothems across the Kasimovian-Gzhelian boundary interval among Midcontinent North America and the Moscow and Donets basins of eastern Europe, based on scale of the cyclothems along with several aspects of biostratigraphy. Outside of these areas, I. simulator (sensu stricto) is known also from other parts of the U.S., and is reported from the southern Urals and south-central China in its expected position between other widespread taxa. Its first appearance is consistent with the current ammonoid placement of the boundary (first appearance of Shumardites cuyleri), and it is also compatible with certain aspects of the distribution of Eurasian fusulinid faunas (e.g., lectotype of Rauserites rossicus).

  • the Carboniferous System use of the new official names for the subSystems series and stages
    Geologica Acta, 2006
    Co-Authors: Philip H Heckel, Geoff Clayton
    Abstract:

    As a result of votes by the Subcommission on Carboniferous Stratigraphy [SCCS] that were ratified by the International Commission on Stratigraphy [ICS] and the International Union of Geological Sciences [IUGS] over the period 1999-2004, the official subdivision of the Carboniferous System has been substantially modified. For subSystems, the terms Mississippian and Pennsylvanian should be used in all regions of the world to replace the more ambiguous and more awkward terms Lower and Upper Carboniferous. Regional geographic names for series and stages may continue to be used in those regions in which they developed, specifically in Western Europe, the USA, and China. However, their global equivalents should be denoted equally, particularly as they become better correlated, in order to facilitate global correlation in future work. The SCCS also voted to standardize the scale of all regional units termed stages at rough equivalency with the global stages now recognized in the Carboniferous (which are similar in scale to those in the adjacent Devonian and Permian Systems). Therefore, the up to 26 subdivisions of the Tournaisian, Visean, Namurian, Westphalian and Stephanian of the regional western European classification should now be ranked and termed only as substages.

Claudia Spalletta - One of the best experts on this subject based on the ideXlab platform.

  • conodonts across the devonian Carboniferous boundary a review and implication for the redefinition of the boundary and a proposal for an updated conodont zonation
    Geological Magazine, 2017
    Co-Authors: Carlo Corradini, Claudia Spalletta, Angelo Mossoni, Hanna Matyja, Jeffrey D Over
    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 .

Angelo Mossoni - One of the best experts on this subject based on the ideXlab platform.

  • conodonts across the devonian Carboniferous boundary a review and implication for the redefinition of the boundary and a proposal for an updated conodont zonation
    Geological Magazine, 2017
    Co-Authors: Carlo Corradini, Claudia Spalletta, Angelo Mossoni, Hanna Matyja, Jeffrey D Over
    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 .