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A new neoselachian shark from the Upper Triassic of Grozon (Jura, France)

Published online by Cambridge University Press:  01 September 1998

GILLES CUNY ,
MICHEL MARTIN ,
RAYMOND RAUSCHER  and
JEAN-MICHEL MAZIN
GILLES CUNY
Affiliation:
Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, UK
MICHEL MARTIN
Affiliation:
Musée d'Histoire naturelle, 115, boulevard Eurvin, 62200 Boulogne-sur-Mer, France
RAYMOND RAUSCHER
Affiliation:
Centre de Géochimie de la Surface (C.N.R.S.), Institut de Géologie, 1, rue Blessig, 67084 Strasbourg cedex, France
JEAN-MICHEL MAZIN
Affiliation:
Laboratoire de Géobiologie, Biochronologie et Paléontologie humaine, Université de Poitiers, 40, avenue du Recteur Pineau, 86022 Poitiers cedex, France
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Abstract

Two successive assemblages of vertebrate microremains have been found at Grozon (Jura, northeastern France). Palynological analysis confirms a Norian age for the first one and a Rhaetian age for the second. A new species of neoselachian shark, Grozonodon candaui, is erected from isolated teeth of Norian age, based on their enameloid ultrastructure. Distinctive parallel-fibred enameloid is recognized among teeth previously assigned to Hybodus minor, which therefore represents another early neoselachian shark. These structural characteristics confirm the close relationship of hybodont and neoselachian sharks.

Type
Research Article
Information
Geological Magazine , Volume 135 , Issue 5 , September 1998 , pp. 657 - 668
Copyright
© 1998 Cambridge University Press

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