Purbeck beds (Late Jurassic) in the Phare de Chassiron section (Île d’Oléron, NW Aquitaine Basin, France): Refined age-assignment and long-term depositional sequences

摘要: In western european basins, lowering of relative sea-level during the Late Jurassic-Early Cretaceous led to widespread deposition in numerous basins so-called Purbeck facies. Age-assignment and longdistance correlations are difficult establish such shallow marine continental deposits, where ammonites generally lacking. This paper aims present new biostratigraphical sedimentological data from Phare de Chassiron section, located at part Aquitaine Basin (SW France), beds crop out. Marine bands, interfingered within beds, allow refining age-assignment these using dinoflagellate cysts, calcareous nannofossils magnetostratigraphy. Most appear have a Tithonian age. Uppermost although not precisely dated, younger than Early Berriasian. Field sedimentology, palynofacies trace-element (strontium) on carbonates, depositional environments be characterized sequence-stratigraphy scheme established. section provides an unique, continuous record, Basin, final exposure, Tithonian, former Kimmeridgian open-marine platform. The may considered as one most important exposures facies age Europe.