A late-glacial and holocene pollen diagram from Cienaga del Visitador (Dept. Boyaca, Colombia)

In a C 14 dated pollen diagram from ”Cienaga del Visitador” (ca 6°8’N; 72°47’ W) in the Colombian Eastern Cordillera the zones Ib + Ic + II (including the Allerød and Bølling interstadials) form one fluctuation in the diagram, as the short cold zone Ic is not reflected. An earlier Late-glacial interstadial is recognized and is called Susacá-interstadial. It probably lasted from about 13900 to 13100 B.P., was colder than the Bølling-interstadial, and is probably reflected in pollen diagrams from other parts of the world. The Holocene part of the diagram shows very high Gramineae-percentages, apparently due to a considerable lowering of the ”tree-line”. This must have been caused by the fact that the Holocene local climate has been much drier than the Late-glacial, even dominating the effect of the increase of temperature on the tree-line. The pollen zonation is nevertheless rather clear, and directly comparable with that from the Sierra Nevada del Cocuy and other areas. The contemporaneity of the Colombian and European pollen zones, strongly suggested or proved by earlier partly-dated diagrams, seems to be fully confirmed by the present one.