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Paläontologische Zeitschrift

, Volume 74, Issue 1–2, pp 171–185 | Cite as

Teeth of enigmatic neoselachian sharks and an ornithischian dinosaur from the uppermost Triassic of Lons-le-Saunier (Jura, France)

  • Gilles Cuny
  • Adrian Hunt
  • Jean-Michel Mazin
  • Raymond Rauscher
Article

Abstract

Shark teeth and an ornithischian dinosaur tooth are described from a new palynologically dated Rhaetian locality at Lons-le-Saunier (Jura, France). The structure of the enameloid of the teeth ofSynechodus rhaeticus has been studied, but this appears quite different from the usual pattern seen in neoselachian sharks, making the precise relationships of this species difficult to determine. On the other hand,‘Hybodus’ minor, which has long be thought to be a hybodont shark, is included among the Synechodontiformes. The find of the tooth of an ornithischian dinosaur is also reported. Study of the Lonsle-Saunier site seems to indicate a change in the marine faunas during the Rhaetian transgression, preferentially affecting the neoselachian sharks, which increase in abundance, and thedurophasous bony fishes, which become dominated bySareodon tomicus.

Keywords

Posterior Tooth Rhaetian Palynomorphs Type Tooth Shark Tooth 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Kurzfassung

Von einer neuen rhätischen Fundstelle bei Lons-le-Saunier (Jura, Frankreich) werden Zähne von Haien und einem Dinosaurier der Ordnung Ornithischia beschrieben. Die stratigraphische Einordnung der Fundstelle basiert auf palynologischen Daten. Die Struktur des Enameloides vonSynechodus rhaeticus wird beschrieben; sie unterscheidet sich deutlich von jener der Neoselachier, wodurch die systematische Zuordnung dieser Art erschwert wird. ‘Hybodus’minor wird zu den Synechodontiformes gestellt. Ornithischier sind aus der neuen Fundstelle durch einen Zahn nachgewiesen. Die Befunde von Lons-le-Saunier deuten auf einen Faunenwechsel im marinen Bereich während der Rhät-Transgression hin, wobei besonders die Neoselachier sowie die durophagen Actinopterygier, letztere überwiegend mit der ArtSargodon tomicus, deutlich häufiger werden.

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Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 2000

Authors and Affiliations

  • Gilles Cuny
    • 1
  • Adrian Hunt
    • 2
  • Jean-Michel Mazin
    • 3
  • Raymond Rauscher
    • 4
  1. 1.Department of Earth SciencesUniversity of BristolBristolUK
  2. 2.Mesalands dinosaur Museum and Natural Science LaboratoryMesa Technical CollegeTucumcariUSA
  3. 3.Laboratoire de Géobiologie, Biochronologie et Palśeontologie humaineUniversité de PoitiersPoitiers cedexFrance
  4. 4.Institut de GéologieCentre de Géochimie de la Surface (C.N.R.S.)Strasbourg cedexFrance

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