GEODYNAMICAL EVOLUTION OF A FORELAND BASI N OF THE ATLAS REGION (MOROCCO) - THE NEOGENE AND QUATERNARY DEPOSITS OF THE NORTHERN SIDE OF THEATLAS OF MARRAKESH

From the Upper Eocene-Oligocene, which is characterized by a passage f rom marine strata of the Middle Eocene to continental Oligocene strata (?), the northern Atlas basin functions as a foreland basin. The sili ciclastic deposits of the Neogene and Quaternary fill in this basin wh ich is called the Haouz of Marrakesh. The latter is part of a tectonic depression. The basin is not homogeneous: it is made of small units w ith specific sedimentary dynamics and contents. Thus in each one of th ese units, the deposits have their own organization (alluvial fans, fl uviatile formations, etc.) and their distribution is controlled by the morpho-structural setting.