Absence of last glacial maximum records in lowlan tropical forests
Amazon Basin ; Brazil ; C 14 dating ; Lateglacial ; Lithology ; Mineralogy ; Palaeo-environment ; Palaeoclimate ; Palynology ; Quaternary ; Sedimentology ; Tropical rain forest
Environmental conditions of the lowland tropical forests during the last glacial maximum (LGM) between ca 20,000 and 18,000 C 14 yr B.P., are reevaluated in terms of dating control and lithology analyzed in seven pollen records from South America
. is indicated by an abrupt decrease in forest pollen and by a corresponding increase in grassland pollen. Concurrent drying up of the lake shows that climate, in particular aridity, was the major cause of this change. The aridity predates agriculture marked