This is a critical appraisal of the existing evidence on the history of Amazonia during the past 1.8 million years. Contributions from geology, geomorphology, paleoclimatology, pedology, botany and zoology are reviewed, with special emphasis on neotropical birds, butterflies, and plants. Much new materials is introduced, along with background information and alternative hypotheses. The book will be of value to ecologists, foresters, and planners interested in Amazonian vegetation.