Étude systématique et statistique des peuplements de foraminifères et d'ostracodes du Callovo-oxfordien dans la région de Besançon

Abstract : The study focuses on the microfaunic content of Callovo-Oxfordian formations in Northern Jura. The samples come from three sections located in the Besançon region. These are from North to South: Palente, in the outskirts of the city, Epeugney 15 km south and Arc sous Montenot 25 km south of the previous cut.Foraminifers and ostracods were rigorously counted and specifically determined. The main species of foraminifera are described and illustrated. The genera Frondicularia, Haplophragmium and Ammobaculites are the subject of a short biometric study. The study of the distribution of foraminiferal and ostracode species is done through the use of statistical methods: mainly correspondence analysis and discriminant analysis. Ten groups of foraminiferous species and four of ostracods are individualized. Their distribution is specified, then compared with that of the other organisms present in the sediment and with sedimentological data: calcimetry, composition of the clays. The interpretation of the observations is made taking into account the paleogeographic and palaeoecological framework defined by the authors who studied this region (Enay, 1968, Contini, 1976, Gaillard, 1983). The significance of the importance of different groups is discussed. The distribution of certain organisms seems to be conditioned by terrigenous inputs. An influence of bathymetry is also considered. With the help of the lessons provided by this study, a more precise reconstruction of the evolution of deposit environments is proposed.
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Hervé Piotelat. Étude systématique et statistique des peuplements de foraminifères et d'ostracodes du Callovo-oxfordien dans la région de Besançon. Paléontologie. Université Claude Bernard Lyon 1, 1984. Français. ⟨tel-01998852v2⟩

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