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Resumo

The existence of climatic oscillations during the Quaternary in the Neotropics was inferred from the distributions and diversities of the modern flora and fauna. Recent data on soils, geomorphology, palynology, and paleoclimatology confirm the existence of periods of aridity and permit more accurate definition of their durations and impacts. A review of linguistic and archaeological evidence reveals patterns similar to those exhibited by a wide range of biological phenomena. The significance attached to these similarities depends on the theoretical paradigm by which they are judged.

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