puits (1) végétation (1) région (1) pollen (1) paysage (1) lac (1) histoire (1) analyse (1) métal lourd (1) changement écologique (1) couverture (1) âge (1) climat (1) Counting (1) History (1) Identification (1) Antiquities, Prehistoric (1) Volcanic ash, tuff, etc (1) Varves (1) Social sciences (1) Pollen (1) Plants (1) Palynology (1) Prehistoric peoples (1) Landscapes (1) Lake sediments (1) Identification (1) History (1) Germany, Northern (1) Counting (1)