Palynological Investigations of Two Post-Glacial Peat Bogs Near the Boundary of Bolivia and Peru

We explored peat bogs of the northern Andes of Bolivia to analyse post-glacial variations of vegetation and climate. Pollen diagrams show that the post-glacial period began at about 10 000 BP with a relatively cold and dry phase. However, the main climatic changes since the last ice age took place immediately before that time. About 7500-5500 BP there was probably a moderately humid and warm period. Then moisture increased till approx. 3500 BP. Since then, a period of quite humid high mountain steppe conditions has developed.