This book focuses on the problems of the Quaternary in South America and Antarctic Peninsula, with a strong emphasis in the paleoenvironmental and paleoclimatic approach. It is based on contributions presented at the South American Regional Meeting held in Neuquen, Argentina.1. Carl C:zon Caldenius and the Swedish work on Quaternary geology in Argentina 2. Quaternary palynology of Chile 3. Geology and palaeontology of Pleistocene sediments at Punta Hermengo area (Miramar, Province of Buenos Aires, Argentina): Some palaeoclimatic aspects 4. Evidences of sea oscillations of the Late Quaternary in R?o Grande do Sul, Brazil, provided by palynological studies 5. Fluctuations of some glaciers in the Upper Atuel River basin, Mendoza, Argentina 6. Pollen analysis of Gruta del Indio 7. Quaternary sediments in the Estaci?n Berraondo area (Buenos Aires Province, Argentina) 8. Museo de La Plata Radiocarbon Measurements I 9. The utility of a glacier inventory to developing countries such as Bolivia 10. Radiocarbon chronology of a tephra layer in Rio Traful Valley, Province of Neuquen, Argentina 11. Las Buitreras Cave and the palaeoenvironments of the Rio Gallegos valley, Province of Santa Cruz, Argentina