Abstract
Abstract In the Mont Sacon series (central French Pyrenees) the stratigraphic succession from the Jurassic to the Neocomian (lower Cretaceous) can be observed. Four groups are distinguished: the Liassic, the middle and upper Jurassic, the terminal Jurassic, and the Neocomian. By means of the microfauna, these strata are correlated with sequences in the Pyrenees and the Aquitaine basin. Several important sedimentary breaks--in the lower Bathonian, Oxfordian, Sequanian, and the base of the upper Portlandian (Jurassic), and the basal Valanginian and upper Neocomian (Cretaceous)--are evidence of changes in sedimentary environment at least partly due to movements of the basement.
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