“…In general, alluvial deposits have fairly typical pollen content with low concentration, large amount of reworked (secondary) pollen, and pollen produced by plants living at higher altitude vegetation belts . In the Po Plain, for example, many archaeological sites dated to the Middle Bronze age show large amount of reworked pollen coupled with maxima of Pinus, together with Abies, Fagus, Betula, Picea and pollen grains at the bottom layer of the pollen diagram (Mercuri et al, 2006(Mercuri et al, , 2014b.…”