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Découverte d'un nouveau gisement de stégocéphales d'une conservation exceptionnelle dans le Trias d'In Amenas (Bassin d'illizi, Algérie)
Abstract and Figures
In the In Amenas area, in the North part of the Basin of Illizi, an exceptional new fossil Amphibia deposit as regards richness and conservation has been discovered. It is localized at the base (Formation I of 10m thickness) of the Triassic argilo-sandy series of Zarzaïtine of which the reference cross section is plotted in the place called «La Reculée» in an interval corresponding to a sebkha filling (Lagerstätte). The paleontological site extended over10x10m2 delivered well preserved crania,piled up the ones on the others, as well as some associated post-cranial elements, of which ribs and vertebras. It testifies to a mass mortality. The preliminary identification of the specimen described in this paper would let believe that it is about a new species of paracyclotosaur, capitosaur group (temnospondyl Amphibia). This discovery allows: i) to confirm the Lower- Middle Triassic age of the base of the «série de Zarzaïtine»; ii) to show a local paleoclimate characterized by alternation from dry to humid periods and ending into dry, - to propose that this site must be protected. Another paper will complete this one and will be in relation, particularly, with the systematic, phylogenetic and paleobiological study of the collected stegocephales.
Figures - uploaded by J. Sébastien Steyer
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