Preliminary studies for the construction of the Provence canal revealed a major overthrust placing the Triassic over the Cretaceous in the region east of Sainte-Baume between Glacieres and Mazaugues, France. The area is divided into three structural zones. The northern zone consists of the Mazaugues plateau and its Jurassic substratum with no evidence of significant tectonic activity. The intermediate zone, including the Triassic and the Lias, was subjected to strong structural deformation as illustrated by two anticlines in the Muschelkalk limestones. Between the two anticlines a synclinal fold affects fossiliferous Jurassic marl. The southern zone is the Jurassic aureole at the border of the Beausset basin which consists of a rigid plate of limestone and dolomite formations. Tangential movement in a southeast-northwest direction caused the folding of the plastic beds. As the movement continued the inverse flank was sheared and the normal flank overrode the Cretaceous of the Mazaugues monocline.