Abstract
On the north bank of the Seine estuary, the oxfordian-kimmendgian clays, as well as the aptian sandy-clay formations, with a NE dip, have been exposed by several phases of down-cutting and choked by coarse deposits. These paleotopographies, of various age (but where Wurmian features are distinguishable by their sheer importance) are buried to the South by the Flandrian series of silty-clay, interbedded by peats and peeble off-shore spits. To the North, they join a fossil cliff where long period of formation, under various morphoclimatic systems, is shown by the deposits which mask its basis. The consequence is a large variety of geotechnical situations, both for the deapth and nature of the levels usable for foundations and for the conditions of water circulation within the quaternary deposits. The implication for some important portuary and urban realisations and projects are analyzed.
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