Abstract
We report here the discovery of forest beds in the Amazon Basin radiocarbon dated to the Wisconsin–Wurm glaciation. These are the first dates from the last glaciation determined on Amazonian samples. The locality is in Ecuador, at 1,100 m elevation, near the upper limit of the present Amazonian rainforest. Both pollen spectra and Podocarpus wood in the deposits suggest that vegetation comparable to the present Andean forest grew at least 700 m lower than it does now, suggesting a temperature depression of at least 4.5 °C for the Amazon lowlands.
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