ANTHROPISATION MARINE SEDIMENTATION AND M ORPHOGENESIS ON THE NORTH SHORE OF MARSEILLES LACYDON SINCE NEOLITHIC (VERNE,J EXCAVATION)

The North shore sediments of the antic harbour oi Marseilles reflects a complex history. As early as the Neolithic period, a noticable scour ing of soils is identified and related to an extension of anthropisati on. The first environnmental crisis occured around 3860 +/- 130 B.P. ( 2760-1980 B.C.). The silting of the maerl bio-accumulation and the ois ters anthropic deposit will stop the maerl growth. It is a biological crisis linked with human coatal settlements. No morphological crisis i s detected on the interland's hills. When Greeks colonized and founded Marseilles around 600 B.C., marine biocenosis of the north shore of t he antic harbour. were stronlgy degraded. The successive urbanization of Marseilles' hills will lead to a major detritic crisis. The impact of anthropization is therefore determining after 600 B.C., not only on the shores but also on the hinterland.