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REFERENCES Brühwiler T., Goudemand N., Galfetti T. & Bucher H. 2007: Early Triassic ammonoid biostratigraphy and a new highresolution carbon isotope record from Tulong area, South Tibet. 5th Swiss Geoscience Meeting, Geneva. Galfetti T., Bucher H., Ovtcharova, M., Schaltegger U., Brayard A., Brühwiler T., Goudemand N., Weissert H., Hochuli P. A., Cordey F. & Guodun K., 2007a: Timing of the Early Triassic carbon cycle perturbations inferred from new U-Pb ages and ammonoid biochronozones. Earth and Planetary Science Letters, 258, 593-604. Galfetti T., Hochuli P.A., Brayard A., Bucher H., Weissert H. & Vigran O.V. 2007b: Smithian-Spathian boundary event: Evidence for global climatic change in the wake of the end-Permian biotic crisis. Geology 35:291-294. Orchard M.J., 2007: Conodont diversity and evolution through the latest Permian and Early Triassic upheavals, Palaeogeography Palaeoclimatology Palaeoecology 252 (2007), 93-117. Payne J.L., Lehrmann D.J., Wei J., Orchard M.J., Schrag D.P. & Knoll A.H., 2004: Large perturbations of the carbon cycle during recovery from the end-Permian extinction, Science 305 (2004), 506–509. 3.8 New data on the Bouwxiller Formation (Eocene, Lutetian) Lavoyer Thibault & Berger Jean-Pierre Département de Géosciences, Géologie et Paléontologie, Université de Fribourg, chemin du musée 6, CH-1700 Fribourg The old quarry in Bouxwiller is a historical outcrop studied since the beginning of the XIXe century (Cuvier 1812). It is located in the village of Bouxwiller, in the western part of the North Middle Upper Rhine Graben in Alsace, France (Fig. 1). Previous studies from the marls situated below and above the Bouxwiller limestone dated the deposit to the mammal zone MP 13 (Jaeger 1971). This author postulates that the fauna of the two levels can be considered as homogeneous. The outcroup consists of fossiliferous limestones and clays with a very small proportion of detrital elements. All samples come from the “Ensemble supérieur” of the Bouxwiller formation, of the marly levels directly over- (coll. Lavoyer 2006-2007) and underlying (Collected by R. Isenmann during the eighties) the Bouxwiller limestone s.s. (Fig 2). It has provided new fossils of several species, notably otoliths, mammal and reptilian teeth (crocodiles (with some serrated teeth (pristichampsids)) and lizard), fragments of turtle shells, osteoderms, charophytes (with Maedleriella embergeri), gastropods (Planorbis sp., Hydrobia sp., Melanopsis ?) and ostracods. R. Isenmann has also provided access to his private collection, composed of reptilian and mammal teeth and bones. They originate from the green marls, in the upper part of the limestone/clay alternation just under the Bouxwiller limestone s.s. The purpose of this work is to compare the various levels of the Bouxwiller Formation (biostratigraphy, paleoecology, taphonomy) and to confront these new data with the existing literature to confirm (or not) the homogeneity of the Bouxwiller fauna. This study is a part of the PhD of T. Lavoyer and is financed by the SNF Project 200020-109457 and 200020-118025 “Paleontology and Stratigraphy of the South Rhine graben during the Paleogene”. We thank Mr Rodolphe Isenmann for providing access to his personnal collection. 12 Symposium 3: Palaeontology
126 Symposium 3: Palaeontology Figure 1. Location of the outcrop (modified from Berger et al. 2005) Figure 2. Lithology (modfied from Trauth et al. 1977) REFERENCES Berger J.-P. Reichenbacher B., Becker D., Grimm M., Grimm K., Picot L., Storni A., Pirkenseer C., Derer C., Schaefer A., 2005b. Eocene-Pliocene time scale and stratigraphy of the Upper Rhine Graben (URG) and the Swiss Molasse Basin (SMB). International Journal of Earth Sciences, 94(4): 711-731. Cuvier G. 1812. Recherches sur les ossemens fossiles où l’on rétablit les caractères de plusieurs animaux dont les révolutions du globe ont détruit les espèces. E. d'Ocagne, Paris 3 : 1-436. Jaeger J.-J.,1971. La faune des mammifères du Lutétien de Bouxwiller (Bas-Rhin) et sa contribution à l’élaboration de l’échelle des zones biochronologiques de l’Eocène européen. Bull Sci géol Alsace Lorraine 24(2-3):93-107 Trauth N., Cavelier C., Sommer F., Tourencq J., Pomerol C., Thiry M., 1977. Aperçu sur la sédimentation paléogène du synclinal de Bouxwiller, comprise entre les Marnes à Rynchonnelles (Bathonien) et le conglomérat du Bastberg (Oligocène). Sci. Géol. Bull, 30, 2, p. 91-100.
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