The structure of the Rehamna Massif, in the Moroccan Hercynian Belt, can be related to the development of a first compressive regime followed by another one of extensional character. The Skhour Nappe and Eastern Rehamna were emplaced to the W or NW during the compressive regime, simultaneously with the development of prograde metamorphism of barrovian affinity. The extensional tectonic gave rise to different ductil shear zones with contemporary retrogressive metamorphism, which caused the extension of the belt to the NE and to the 5E. The extensional regime is at the origin of the marked condensation of the barrovian metamorphic zones