The allochthonous Musa group of upper Triassic shale, Jurassic limestone, dolomite, marl, and radiolarite, and Cretaceous to Paleogene clastics lies upon Senonian (upper Cretaceous) autochthonous marl and shale of the Tangier massif at the north end of the Rif mountains in Morocco. The group more closely resembles the formations of the Gibraltar area than nearby formations to the south in Morocco. The significance of the Beliounis flysch, believed to be of Cretaceous to Oligocene age, is unexplained. It may be a remnant of the cover of the Musa group although presence of other facies of the same age in the area contradicts this possibility.

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