Southern Pyrenees has provided an abundant fossil record of dinosaur eggs and eggshells. Historically, the oofamily Megaloolithidae has shown its predominance over any other group of fossil eggs in this region. In addition, this oofamily is world-wide distributed being represented by, at least, four oogenus and 20 oospeices. Considering that the eggshell is a high stable structure, this number of Megaloolithus‘s oospecies is too high for such a relatively short time-interval (Campanian to Maastrichtian; less than 7 My). The structural characters used to define these oospecies are critically revised. As a consequence, three structural groups have been identified, and only ten oospecies have been considered valid. Four of those oospecies have been recognized in Southern Pyrenees: M. aureliensis, M. sirugei, M. mamillare and M. baghensis. The oogenus Cairanoolithus, historically included in Megaloolithidae oofamily, is reevaluated. All evidences suggest that this type of fossil egg is, definitively, different from any other Megaloolithus. Consequently, a new oofamily is erected (Cairanoolithidae oofam. nov), which emphasizes the singularity of cairanoolithid eggs. Phylogenetical analysis also suggests that the eggs of Cairanoolithidae oofam. nov. could be laid by ornithischian dinosaurs. New oological material is described here, including the first spheroolithid oospecies (Spheroolithus oosp. nov.) from the Upper Cretaceous of Europe. Several oospecies of Prismatoolithus (Prismatoolithus oosp. nov, Prismatoolithus cf. levis, Prismatoolithus oosp. indet.) and few eggshells of ratite-morphotype (cf. Ageroolithus fontllonguensis) have been identified. In addition, the great number of specimens attributed to Pseudogeckoolithus oogenus allows re-describing and re-assigning this ootaxon to Mesozoic lizards. The space-temporal variation of the oological diversity in the Southern Pyrenees could be a consequence of environmental changes during the end-Cretaceous or even due to preferences in the nesting-site of each group of dinosaurs. Finally, biostratigraphical studies based on the successions of megaloolithid oospecies have been performed in Coll de Nargó and Àger-Tremp basins, and the European Megaloolithus succession has been updated. As a result, three oozonones have been described: M. aureliensis + Cairanoolithus oozone dates the Late Campanian, M. siruguei oozone the Early Maastrichtian and M. mamillare + M. baghensis oozone the Late Maastrichtian.

Au Jurassique supérieur, la plateforme carbonatée jurassienne séparait le bassin de Paris du Bassin delphino-helvétique. Pauvres en fossiles biostratigraphiques, les dépôts du passage Oxfordien- Kimméridgien sont partiellement datés. L'organisation et la hiérarchie communes des séquences de dépôt observées dans le Jura franco-suisse et en Lorraine permettent d'établir des corrélations régionales haute résolution et montrent l'implication des cycles d'excentricité et de précession dans la formation des séquences. Les corrélations permettent de réviser le cadre bio-lithostratigraphique du Jura français et de contraindre l'évolution de la géométrie de la plateforme et de ses paléoenvironnements. Réalisées sur des huîtres et Trichites issus de niveaux de passage Oxfordien-Kimméridgien du Jura et de Normandie, des analyses isotopiques montrent une évolution climatique commune à tout le pourtour du bassin de Paris, intimement liée à la dynamique sédimentaire de la plateforme jurassienne. L'étude des entités coralliennes de l'Oxfordien terminal montre que leurs compositions et leurs morphologies sont fonction de leur position sur la plateforme et de l'évolution du niveau marin relatif. A la fin de la zone à Bimammatum, l'enregistrement de pistes de dinosaures dans les dépôts de la plateforme exprime une phase d'émersion. La position de celle-ci dans le cadre séquentiel montre que l'enregistrement des empreintes est lié à un contexte paléogéographique, paléoenvironnmental et séquentiel exceptionnel, favorisant le développement, puis l'induration et le recouvrement de laminites microbiennes et la migration des dinosaures sur la plateforme / The Upper Jurassic Jura platform separated the Paris basin and the delphino-helvetic basin. The scarcity of biostratigraphic fossils of the Oxfordian-Kimmeridgian platform deposits prevent from establishing accurate dating. The common organization and hieacrchy of depositional sequences observed in French and Swiss Jura and in Lorraine allow to establish high-resolution regional correlations, and show the involvement of eccentricity and precession cycles in the formation of sequences. Correlations allow revising the French Jura bio-lithostratigraphic framework and highlight the evolutions of platform geometry and palaeoenvironments. Isotopic analysis based on oyster and Trichites specimens, sampled in several beds from the Upper Oxfordian-Lower Kimmeridgian, in Jura and Normandie, show a similar climatic evolution, all around the Paris basin. This evolution seems closely linked to the Jura platform sedimentary dynamics. The study of the Upper Oxfordian reef entities shows that their compositions and morphologies depend on their position along the platform and the evolution of relative sea level. In the end of the Bimammatum zone, the record of dinosaur trackways, in the platform deposits, expresses an emersion phase. Its position in the sequential framework shows that the track record was abled by an exceptional palaeogeographic, palaeoenvironmental and sequential context that favored on the one hand the development, induration and covering of microbial laminites and on the other hand the migration of dinosaurs across the platform