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Les paléoflores du Jurassique moyen et supérieur (Bathonien - Oxfordien) du bassin parisien et de ses marges

Abstract : The palaeoflora of Late and Middle Jurassic of the Paris basin is documented by a set of rather important outcrops, relatively little know, containing fossils of every type, mainly imprints often without cuticle, sometime with, or otherwise silicification in flint nodules. Eight historic or new outcrops were studied, plus four isolated fossils, all dating from the Bathonian-Oxfordian interval and distributed on the whole Paris basin and its margins. Three deposits were studied in the eastern part of the basin, its Arc-en-Barrois (late Bathonian), Étrochey (early and middle Callovian), and Laignes (middle Callovian). They all belong to the archipelago of the Burgundian platform, whose islands are covered by a mixed xerophytes Brachyphyllum forest. The deposit of Auxey, situated to the south, close to the city of Beaune, dated of late Oxfordian shows on the contrary a flora of wet environments, rich in ferns. Two others outcrops were studied close to the seuil du Poitou, the late Callovian flora of Sauzé-Vaussais and Poitiers surroundings, rich in bennettitales, presumably corresponding to relatively open xeromorphic environments. Finally, two last deposits were studied in the west of the basin, on the oriental margin of the emerged Armorican massif, the flora of the late Bathonian of Mamers and Nonant-le-Pin. These two outcrops correspond to a coastal mixed Brachyphyllum forest, also in a xeromorphic environment. Thereby, the Paris basin presents from Bathonian to Callovian exclusively xerophytes floras, corresponding to rather closed paleoenvironments, as on the Burgundian platform, to on the contrary opened enough environments, as in Poitou. The flora of internal environments, far from coasts, are not known for this period. In late Oxfordian on the other hand, the flora of Auxey would indicate rather a certain moistering of the climate, although more ample data are necessary to confirm this interpretation.
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Matthieu Le Couls. Les paléoflores du Jurassique moyen et supérieur (Bathonien - Oxfordien) du bassin parisien et de ses marges. Paléontologie. Rennes 1, 2017. Français. ⟨tel-02372774⟩

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