I should like to preface this paper with a few remarks, as the work of Richard Foster Flint, who died in June 1976, was a major key to interpreting the Quaternary of Isla Chiloé. Fortunately, he was well along on preparing a map of the glacial deposits, and the geological substance of this paper is drawn from this map and the careful and systematic notes he took in the field.
Our field time was during January and February 1976. For Richard Foster Flint, the study was looked upon as an opportunity to relate the glacial events that he and Francisco Fidalgo described at the same latitude on the east side of the Andes in Argentina. For me, the study was a rare sequel to previous studies of Quaternary stratigraphic palynology in southern Chile.
The lowland of northern Isla Chiloé was glaciated by piedmont glaciers of Andean origin. Three offlapping layers of drift are, respectively, thoroughly weathered (Fuerte San Antonio), partly weathered (Intermediate), and fresh (Llanquihue). The coldest climatic regime, shown by the stratigraphic palynology, prevailed when the Fuerte San Antonio drift was deposited. The Intermediate drift dates from at least 57,000 yr B.P. and the Llanquihue from at least 43,000 yr B.P.