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STRATI 2013 pp 261-265 | Cite as

Integrated Biostratigraphy of Calcareous Nannofossils and Ammonoids. Implications for the Definition of the Stratotype of the Berriasian–Valanginian Boundary (139.4 Ma)

  • Samer KenjoEmail author
  • Emanuela Mattioli
  • Stéphane Reboulet
  • Didier Bert
  • Kayed Ma’Loulleh
Conference paper
Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

This work aims to identify the Berriasian–Valanginian boundary (139.4 Ma) in three sections in southeastern France (Vergol, Courchons, and Berrias) by using an integrated biostratigraphy approach, and supports the proposition of the Vergol section as a candidate for the global stratotype section and point (GSSP). An analysis of the distribution of calcareous nannofossils and ammonoids is used to construct a new biochronstratigraphic framework. We use interval zones for establishing ammonoids and nannofossil biozones. The identification of the Berriasian–Valanginian boundary is based on the first occurrence of Tirnovella pertransiens. Coccolith bioevents around the boundary are also helpful, such as the first occurrences of Percivalia fenestrata, Calcicalathina oblongata, and Zeugrhabdotus trivectis. Changes in the assemblages of nannofossils and ammonoids are also used to reconstruct palaeoenvironmental variations. A Nannoconus decline is identified as having occurred during the early Valanginian, which corresponds to a perturbation of the carbon cycle that took place between the early and middle Valanginian.

Keywords

Calcareous nannofossils Ammonoids Integrated biostratigraphy Berriasian–Valanginian boundary 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Samer Kenjo
    • 1
    Email author
  • Emanuela Mattioli
    • 1
  • Stéphane Reboulet
    • 1
  • Didier Bert
    • 2
  • Kayed Ma’Loulleh
    • 3
  1. 1.UMR 5276 LGLTPE CNRS, Observatoire des Sciences de l’Univers de LyonUniversité Lyon 1Villeurbanne CedexFrance
  2. 2.Laboratory of the research Group for Paleobiology and Biostratigraphy of the Ammonites (G.P.A)La MureArgensFrance
  3. 3.Laboratory of Geology, Department of Geology, Faculty of SciencesDamascus UniversityDamascusSyria

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