Vreemde activiteit en vreemd pollen aan de Tjonger (Fr.)
The Late Mesolithic site of Jardinga on the river Tjonger shows signs of a wooden construction that contains wood of different ages. Into a pine log dated 9600 BP, three stakes were inserted of an age contemporaneous with aurochs hunting, dated 6400 BP. The pine was situated in the sediment at a level with abundant pine pollen. Pine pollen values strongly diminish in the course of the Atlantic. Yet at the level of the Mesolithic activity, pine pollen suddenly measures 60%, suggesting that Boreal sediment had been transported when people retrieved the pine log during Late Mesolithic times. The log must at that time have been found at a depth of about 50 cm.