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Bajocian Ostracods from the Krachoua Formation (Beni Kheddache, Southern Tunisia): Implications for Biostratigraphy and Paleoecology

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Paleobiodiversity and Tectono-Sedimentary Records in the Mediterranean Tethys and Related Eastern Areas (CAJG 2018)

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Abstract

Ostracods and charophytes are considered as biological indicators of the environments in the Middle Jurassic strata of southern Tunisian. The biostratigraphic and Palaeoecology studies of the Krachoua Formation undertaken from the region of Beni Kheddache are based on the ostracodfauna and charophyte flora. A Bajocian age is assigned to the upper part of the Krachoua Formation. It consists of a multispecific ostracod association dominated by the following three genera, Limnocythere, Bisulcocypris, and Theriocynoecum which reflect appropriate palaeoecological conditions with a salinity decrease. This is due to the influx and installation of a freshwater pond occasionally developed and enhanced by humid climate coupled to a sea level fall. The occurrence of these species towards the top of Krachoua Formation is synchronous with the increase of silt and clay associated to vertebrate bones reflecting a regressive tendency within a transgressive/regressive sedimentary sequence within a Middle Jurassic long-term regressive cycle.

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Author information

Authors and Affiliations

  1. Faculté des Sciences de Sfax, LR GEOGLOB, Université de Sfax, B-P 802, 3038, Sfax, Tunisia

    Lassad Tiss, Khaled Trabelsi & Fekri Kammoun

  2. Sfax University, 3029, Sfax, Tunisia

    Lassad Tiss, Khaled Trabelsi & Fekri Kammoun

  3. Faculté des Sciences de Tunis, Université de Tunis El Manar II, UR11 ES15, CP 2092, Tunis, Tunisie

    Khaled Trabelsi

Authors
  1. Lassad Tiss
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  2. Khaled Trabelsi
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  3. Fekri Kammoun
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Corresponding author

Correspondence to Lassad Tiss .

Editor information

Editors and Affiliations

  1. Faculty of Sciences of Bizerte, University of Carthage, Amilcar, Tunisia

    Mabrouk Boughdiri

  2. Earth Science Department, University of Zaragoza, Zaragoza, Spain

    Beatriz Bádenas

  3. University of Kansas, Lawrence, KS, USA

    Paul Selden

  4. University of Grenoble Alpes, Grenoble, France

    Etienne Jaillard

  5. Institute of Earth Sciences, Heidelberg University, Heidelberg, Germany

    Peter Bengtson

  6. University of Bretagne Occidentale, Brest, France

    Bruno R.C. Granier

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Tiss, L., Trabelsi, K., Kammoun, F. (2019). Bajocian Ostracods from the Krachoua Formation (Beni Kheddache, Southern Tunisia): Implications for Biostratigraphy and Paleoecology. In: Boughdiri, M., Bádenas, B., Selden, P., Jaillard, E., Bengtson, P., Granier, B. (eds) Paleobiodiversity and Tectono-Sedimentary Records in the Mediterranean Tethys and Related Eastern Areas. CAJG 2018. Advances in Science, Technology & Innovation. Springer, Cham. https://doi.org/10.1007/978-3-030-01452-0_17

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