Le Quaternaire marin du secteur littoral Cap Achakar -Cap Spartel (Tanger, Maroc) : lithostratigraphie et néotectonique

Abstract

Marine Quaternary of Cap Ashakar (Tangiers, Morocco) : lithostratigraphy and neotec tonics. Lithostratigraphy of the marine quaternary deposits of Cap Ashakar (Tangiers, Morocco) allows us to reveal three marine pleistocene formations : • the oldest indicates an upper shoreface depositional environment and has given up a "cold fauna" with two common mediterranean species so far unknown on the Moroccan atlantic coast : Buccinurn undatum and Neptunea contraria ; • the youngest indicates a foreshore depositional environment and dates from the last Interglacial ; • between them, takes place a very thick marine azoic formation, which indicates an upper shoreface followed by a foreshore depositional environment. The morphostructural analysis allows to show the part of the recurrent epeirogenic phenomenas in the morphogenesis of the north Moroccan atlantic coast.