sentences:  A recent study of pollen and other microfossils from a core sample taken in an intermontane valley of the Segura mountains in southern Spain finds "P. prostrata" in a ""Prunus" type" located in two radiocarbon-dated zones from about 2630 BP to about 1550 BP and again from about 790 BP to present.The ecology of the "Prunus" type was "high-altitude open pine forest.