L'evolution tectonique post-hercynienne de la bordure mesozoique des Cevennes meridionales entre Ales et Ganges

Abstract

The southeast edge of the Central Massif, between the Rhone and Herault valleys (France), is an area of Mesozoic rocks cut by a NE-SW fault system. Movement along the faults has been recurrent and from the Triassic through the succeeding Mesozoic, uplift and downwarp resulted in local basins and troughs accumulating distinct sedimentary suites. Intense compressive movements associated with the Pyrenean revolution during the late Eocene produced complex folds and overthrusts imposed upon the normal fault system. Continuation of the activity contributed to the complexity of the structures during the Oligocene. No evidence was found, during recent studies, to support the theory of allochthonous movements during the Oligocene.