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Tropical Climatic Variation on the Pacific Slopes of the Ecuadorian Andes Based on a 25,000-Year Pollen Record from Deep-Sea Sediment Core Tri 163-31B

Published online by Cambridge University Press:  20 January 2017

Linda E. Heusser
Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964
Nicholas J. Shackleton
Godwin Laboratory for Quaternary, Research, Free School Lane, University of Cambridge, Cambridge CB2 3RS, UK


Marine sediments from 3°37′S, 83°58′W yield a well-dated pollen record of equatorial Andean vegetation. Moderate development of Podocarpus -high montane rainforest (∼34,000-28,000 yr B.P.) and increase of high Andean grassland pollen (∼28,000-16,000 yr B.P.) imply an extended dry, cool glacial period following a brief interstade. Rapid stepwise expansion in coastal and montane forest pollen characterizes the deglacial interval. The general correspondence between pollen and oxygen isotope variations in Tri 163-31B suggests that tropical climatic variations in the northern Andes were basically coherent with northern hemisphere glacier variations.

Short Paper
University of Washington

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