Abstract

The messinian erosional surface buried beneath the Guif of Lion has been mapped by to a dense, systematic seismic reflexion profiles survey. A river system running downward the evaporitic basin is carved across this surface. The main stream, the paleo-Rhône, has been surim posed on a mesozoic ridge as deep as 600 m during messinian low sea level. From the consideration of its profile of equilibrium, the authors think that the contemporaneous coastline was lying at about 1 000 m below the last tortonian sea level.

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