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L'évolution des peuplements d'ammonites au cours de l'Oxfordien inférieur (Zone à Mariae et Zone à Cordatum) du Jura (Est de la France) [The evolution of ammonite associations during the Early Oxfordian (Mariae and Cordatum zones) in the Jura area (eastern France)]

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La Sous-Famille des Taramelliceratinae (Ammonitina, Haploceratoidea, Oppeliidae) de l'Oxfordien moyen et supérieur (Zone à Plicatilis, Sous-Zone à Vertebrale - Zone à Bimammatum, Sous-Zone à Berrense) du Nord de la Vienne, France (Province subméditerranéenne) [Subfamily Taramelliceratinae (Ammonitina, Haploceratoidea, Oppeliidae) from Middle and Upper Oxfordian strata (Plicatilis Zone, Vertebrale Subzone - Bimammatum Zone, Berrense Subzone) of N Vienne, France (submediterranean province)]

Identifica??o de flavonóides em Hypericum cordatum (Vell.) N. Robson (Clusiaceae)

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Analysis of surface and root-zone soil moisture dynamics with ERS scatterometer and the hydrometeorological model SAFRAN-ISBA-MODCOU at Grand Morin watershed (France)

Analysis of surface and root-zone soil moisture dynamics with ERS scatterometer and the hydrometeorological model SAFRAN-ISBA-MODCOU at Grand Morin watershed (France)

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La faune ammonitique des marnes à fossiles ferrugineux de la région de Niort, France (Oxfordien inférieur, Zone à Cordatum, Sous-Zone à Cordatum) [The ammonite fauna of the 'marls with ferruginous fossils' from the Niort region, France (Lower Oxfordian, Cordatum Zone, Cordatum Subzone)]

Keywords: Ammonites , Lower Oxfordian , Cordatum Zone , faunal spectrum , palaeoenvironment , palaeobiogeography

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Abstract:

A new collection of ammonites from the 'marls with ferruginous ammonites' in the Niort region (France), previously studied by Grossouvre (1922), provides a large amount of biostratigraphic, paleoenvironmental and paleogeographic information. The fauna is dated Early Oxfordian: Cordatum Zone, Cordatum Subzone, probably the lower part of it. In addition, it is unique in western Europe owing to: 1) the species found of which some appear to be known only in this deposit 2) by the extremely atypical domination of the couple Taramelliceras - Creniceras which represent 2/3 of the specimens. Furthermore, the aspect of the fauna strongly suggests that the habitat was a distal platform unknown in other European strata of the same age. A detailed description of the several species is given, sometimes accompanied by a new taxonomic interpretation.

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