Swiss Journal of Geosciences

, Volume 106, Issue 2, pp 371–395 | Cite as

Kimmeridgian (Late Jurassic) ostracods from Highway A16 (NW Switzerland): taxonomy, stratigraphy, ecology, and biogeography

  • Ulla Schudack
  • Michael Schudack
  • Daniel Marty
  • Gaël Comment


Ostracods are a common microfaunal element of the Kimmeridgian of the Jura Mountains in NW Switzerland. The stratigraphical subdivision within the Kimmeridgian can as clearly be inferred from ostracods as it is the case from the ammonite biozonation. This proves the utiliy of the ostracod biozonation, especially where ammonites are not available or rare. The ostracod-bearing layers of the sequence under study (middle part of the Reuchenette Formation = Banné Member, Courtedoux Member and Lower Virgula Marls) have been deposited in waters with highly brackish to marine salinities (high in the pliohaline range to—predominanttly—brachyhaline according to the Venice System, Oertli 1964). From the base of the section (base of the Banné Member, high brachyhaline in average), salinities slowly decreased, with lowest salinities in the lower dinosaur track levels of Courtedoux Member (high pliohaline on average). They then increased again to higher salinities (high brachyhaline on average) above the upper dinosaur track levels of the Courtedoux Member and the Lower Virgula Marls (lowermost A. eudoxus Zone). These trends perfectly correlate with the increased occurence of ammonites above the upper dinosaur track levels. In terms of Kimmeridgian ostracod palaeobiogeography, the fauna of the NW Swiss Jura Mountains described in this work is most similar to the Aquitan and Paris Basins, a little less to Northern Germany, and even less (with not even half of the species in common) to Southern Germany. The NW Swiss Jura Mountains still belong to a largely boreally influenced “Western and Central European subprovince”, whereas Southern Germany (though located more to the north) was subjected to an enhanced tethyan influence.


Ostracoda Micropalaeontology Biostratigraphy Reuchenette Formation Banné Member Courtedoux Member Swiss Jura Mountains 



Musée jurassien des sciences naturelles, Porrentruy (Canton Jura, Switzerland)



This work results from collaboration between the Palaeontology A16 (Office de la culture, Canton du Jura, Switzerland) and the department of palaeontology of the Freie Universität Berlin (Germany). We are grateful to both institutions for enabling us to accomplish this work. The Palaeontology A16 is funded by the Swiss Federal Roads Authority (FEDRO 95 %) and the Canton Jura (RCJU 5 %). We also acknowledge the technical staff of the Palaeontology A16 for their careful work during the screen-washing of the samples and their patience whilst picking the ostracods studied here. Thanks also go to technical drawers of the Palaeontology A16 for their help with some of the Figures. The authors also acknowledge the invaluable reviews by Ekaterina Tesakova and Ian Wilkinson.


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Copyright information

© Swiss Geological Society 2013

Authors and Affiliations

  • Ulla Schudack
    • 1
  • Michael Schudack
    • 1
  • Daniel Marty
    • 2
  • Gaël Comment
    • 2
  1. 1.Institut für Geologische Wissenschaften, Freie Universität BerlinBerlinGermany
  2. 2.Office de la culture, Section d’archéologie et paléontologie, Paléontologie A16Porrentruy 2Switzerland

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