This volume is a compilation of papers of the final meeting of the IGCP Project 201, Quaternary of South America. The papers deal with a range of topics from quaternary vertebrate palaeontology in Argentina to biostratigraphy and chronological scale of uppermost Cenozoic in the Pampean area.1. Obituary - John H.Mercer 1922-1987 2. The diamictons of Rio Blanco basin, Cordon del Plata, Mendoza 3. Where was the sea-level 30-50,000 years ago? The Patagonian point of view 4. Santiago de Chile winter rainfall since 1220 as being reconstructed by tree rings 5. Holocene sedimentology and ostracods distribution in Lake Titicaca - Paleohydrological interpretations 6. Magnetic susceptibility as an expedite method for characterization and correlation of near shore sediments 7. Patagonian Pleistocene glacial varves: An analysis using variation of their thickness 8. Evidence for a geomagnetic field excursion in the Late Pleistocene (Entre R?os, Argentina) 9. Beaches and cheniers in French Guiana 10. A braided fluvial system in Pleistocenic sediments in southern Buenos Aires Province, Argentina 11. Some comments on grain size indices of surficial deposits from a humid tropical environment: Taubat? basin, Brazil 12. Glacial deposits on the Patagonian Cordillera at latitude 43?30' S 13. Marine diatom study and stratigraphy of Cenozoic sediments in the coastal plain between Morro da Jur?ia and Barra do Una, State of Sao Paulo, Brazil 14. Map of the South American Plains - Its present state 15. Zooarchaeological studies in the humid Pampas, Argentina