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

Abstract

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.

Type
Short Paper
Copyright
University of Washington

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