The evolution of a landscape of river confluence from protohistory until roman period: Geomorphology and palaeoenvironment of the site of parc saint-georges. Lyon (Rh?ne - France) [évolution d'un paysage de confluence de la protohistoire à l'époque gallo-romaine: Géomorphologie et palé oenvironnement du site parc saint-georges à Lyon (Rh?ne - France)]

摘要

The archaeological site of Parc Saint-Georges, Lyon (Rhone valley, France), is located on the right bank of the Sa?ne. The geomorphological study made it possible to identify the original confluence point of the Rh?ne and the Sa?ne during the 1~(st) Iron Age. By the end of the La Tene period, new bioclimatic conditions lead to the incision and shining of the Rh?ne, to the East. Then the Sa?ne opened a more direct channel across the plain. The two courses of the Sa?ne met south of the site, around the beginning of the 1~(st) century A.D. The riverside activities developed there, in close relationship with river bank mobility, from the 1~(st) century to the mid 3~(rd) century. This period marks the filling in of the primitive Sa?ne channel and the initiation of a new course, close to the present one. An interdisciplinary approach (geo-archaeology, fruit/seeds analysis, palynology and malacology) proposes a new reconstruction of the topography, the palaeohydrology, the vegetation and the relationship between humans and their environment from Protohistory to Roman period.