Surveys carried out west of Aix-en-Provence (southern France) supplemented by drill-core data from an exploratory boring for oil indicate that the upper Jurassic and lower Cretaceous are of greater thickness than heretofore thought. The facies are transitional between those of the coast and those of the Vocontian basin. This part of Provence, although formerly considered to have been affected only by superficial folds, is actually a large recumbent fold formed during two tectonic phases. One occurred during the late Cretaceous, developing an east-west-trending ridge; the other occurred during the upper Eocene, causing thrusting and overturning of the fold, whose crest had been removed by erosion.

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