Résumé
At Saint-Pierre-les-Elbeuf in the Seine valley four ancient loesses are separated by four interglacials palaeosols: Elbeuf I (Eemian), Elbeuf II, Elbeuf III and Elbeuf IV. Above the lowest soil (Elbeuf IV), there is a thin cover of whitish alluvial sands and a calcareous interglacial tufa which contains a Lyrodiscus assemblage considered presently as a biostratigraphical marker of MIS 11. Elbeuf IV complex, sands and tufa, of 400 ka age is in agreement with the stratigraphy and new OSL dates. Above the tufa, at the base of a loess accumulation (MIS 10), an Acheulean implements has been discovered. This last level is currently the oldest known human settlement in Normandy. It is located at the edge of a river bank and is characterized by a few weathered bones (macrofauna) and by numerous artefacts which indicate debitage processes and tool manufacture (handaxes and flake tools).