1. CNR - Institute for the Dynamics of Environmental Processes; Lab. of Palynology and Paleoecology; Research Group on Vegetation, Climate and Human Stratigraphy; Piazza della Scienza 1 20126 Milano Italy
2. Superintendency for Cultural Heritage and Activities; Autonomous Region of Valle d'Aosta; Piazza Roncas 12 11100 Aosta Italy
3. Dept. of Humanities; Sect. of Prehistoric and Anthropological Sciences; University of Ferrara; Corso Ercole I d'Este 32 44100 Ferrara Italy
4. Institute for the Study of the Ancient World; New York University; 15 East 84th Street New York NY 10028 USA
5. Dept. of Environmental and Earth Sciences; University of Milano-Bicocca; Piazza della Scienza 1 20126 Milano Italy