IN-SITU BUILDING OF DUNES SINCE THE SUB B OREAL (3600 BP) EVIDENCE OFCHRONOLOGICAL CONTINUITY ON THE NORTHERN COAST OF BRITTANY - AN EXAMPLE IN ANSE-DU-VERGER (ILLE-ET-VILAINE)

A series of storms, from 1990 to 1995, has revealed new cross-sections on the Northern Coast of Brittany, more specifically close to St Malo , in the Anse du Verger (Verger cove). They have also allowed the effe cts of storms surges on coastal features to be followed. An anthropoge nic shell layer, discovered in a dune and dated from 3640 (conventiona l BP) is covered by a storm surge deposit, dated from 2460, convention al BP. A comparison between present and sub-boreal surges is attempted . Then a chronology for dune building is proposed, in relation with se a level rise and surges. The possibility of an accumulation feature ri sing itself instead of retreating before an increasing sea level is pr oposed.