Le Gour de Tazenat et l'évolution de l'environnement du Tardiglaciaire au Boréal dans la Chaîne des Puys septentrionale (Massif Central, France)

A core taken from the lacustrine deposits of the Gour de Tazenat, below 66 m of water, allowed us to describe the environmental changes from the early Late Glacial to the Boreal in the northern Chaine des Puys. The Middle Dryas is particularly well recorded and the Late Dryas can be subdivided into three cold sub-oscillations. The same sequence contains two tephra beds (volcanic ash) : (i) one is mugearitic, dated at 10,280 a BP and within the Allerod ; (ii) the other is trachytic, dated at about 8,220 a BP and within the Boreal. The Tazenat volcano erupted prior to 29,000 a BP.