Beschreibung:
New data on the holocène palaeoenvironment of the northern rim of « Balmes viennoises », Isère, France. — Boreholes and archeological diggings have been performed in a marshy valley of the Bas-Dauphiné on the occasion of works realized for the completion of a new motorway around Lyons. In the marsh, the total holocène sédimentation is characterized by thin 3.50 m thick deposits and by the development of a peaty layer of Boréal Age ; the thickness of the upper mineral deposits is linked to land clearance since the gallo-roman period at least and to the climate degradation of the Little Ice Age. The site of the gallo-roman « villa » of Saint-Fréjus has been excavated in the foothills ; it allowed the identification of two phases of torrential erosion dated second half of the Ist c. A.D. and IVth-early VIth c. A.D. These two phases could be triggered by wetter climate.
New data on the holocène palaeoenvironment of the northern rim of « Balmes viennoises », Isère, France. — Boreholes and archeological diggings have been performed in a marshy valley of the Bas-Dauphiné on the occasion of works realized for the completion of a new motorway around Lyons. In the marsh, the total holocène sédimentation is characterized by thin 3.50 m thick deposits and by the development of a peaty layer of Boréal Age ; the thickness of the upper mineral deposits is linked to land clearance since the gallo-roman period at least and to the climate degradation of the Little Ice Age. The site of the gallo-roman « villa » of Saint-Fréjus has been excavated in the foothills ; it allowed the identification of two phases of torrential erosion dated second half of the Ist c. A.D. and IVth-early VIth c. A.D. These two phases could be triggered by wetter climate.