The aim of this study of Aurès and Bibans (Tell) Cenomanian and Turonian series is the application of a sedimentological analysis in order to reconstruct the relationships between biocenoses, environments, systems tracts and depositional sequences. A quantitative approach has been developed including the study of variations of organism’s abundance in the sequences and in the palaeogeographic zones and the multivariate data analysis applied to the characterisation of biocenoses. These methods provide, compared to the results obtained by the more classical facies study, new informations about the evolution of the various organisms in the system tracts and their relations with the different palaeogeographic zones.

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