Présentation d'une carte bathymétrique au 1/25 000° du précontinent marseillais. (Au large de la zone limitée par la grotte Cosquer et l'habitat préhistorique de Carry le Rouet)

Abstract

Bathymetric map (1/25 000°) of the outer shelf off Marseilles : From the Cosquer Cave to the prehistoric site of Carry le Rouet. A bathymetric map (1/25 000°) of the outer shelf off Marseilles (France) has been realized, using the plotting sheets from the Hydrographie and Oceanographic service of the French Marine (S.H.O.M). This map allows to find the main geologic characteristics of the observed area during the last glacial period, and, then, accessible to the prehistoric artists of the Cosquer Cave and the hunters of the prehistoric site of Carry le Rouet. The morphological outline drawn already shows the N.W.-S.E. and N.E.-S.W. trends of the submarine reliefs, non-structural slopes which are probably marine shorelines levels situated at -50 m, -90 m, and -100 m and, perhaps 130 m depht, some karstified areas if the multiple endoreic depressions identifiable on the map are interpreted as dolines. This presentation of the bathymétrie document is only a preliminary report since the morphostructural analysis of the maps still going and will, in the future, be correlated with others approaches and more particularly, geophysical and sedimentological data.