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Absence of Last Glacial Maximum Records in Lowland Tropical Forests

Published online by Cambridge University Press:  20 January 2017

Marie-Pierre Ledru
Affiliation:
ORSTOM, 32 av. Henri Varagnat, 93143, Bondy Cedex, France
Jacques Bertaux
Affiliation:
ORSTOM, 32 av. Henri Varagnat, 93143, Bondy Cedex, France
Abdelfettah Sifeddine
Affiliation:
ORSTOM, 32 av. Henri Varagnat, 93143, Bondy Cedex, France
Kenitiro Suguio
Affiliation:
Instituto de Geociêcias, Caixa Postal 11, 34805 422-970, Sao Paulo, SP, Brazil

Abstract

Environmental conditions of the lowland tropical forests during the last glacial maximum (LGM) between ca 20,000 and 18,000 14C yr B.P., are reevaluated in terms of dating control and lithology analyzed in seven pollen records from South America. The reevaluation shows that probably in none of the published records are LGM sediments present or abundant. This conclusion is based on the occurrence of abrupt lithologic changes coupled with changes in sedimentation rate interpolated from radiocarbon dates. These findings suggest that the LGM was represented probably by a hiatus of several thousand years, indicative of drier climates than before or after.

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Short Paper
Copyright
University of Washington

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Absence of Last Glacial Maximum Records in Lowland Tropical Forests
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