Middle Triassic age, established by palynological arguments of Red Sandstone Formation, so-called "Permo-Trias" near Tetrian in the Riffian Internal zones, (Morocco).
Foreign title:
Datation palynologique du Trias Moyen au Sein des gres Rouges "Permo-Triasiques" des Environ de Tetrouan(Rif Septentrional,Maroc)