Late Pleistocene and Holocene Coastal Behaviour from 33°to 40° South, Argentine Republic

Abstract

The coastal behaviour from 33° to 40° South, during two late Pleistocene and one Holocene (Postglacial)transgressions is analyzed. The transgresive episodes were developed in five morphostructural sectors of different tectonic character, at least for the pre-late Pleostocene times. The height of the Sangamon and Holocene deposits found by researches on the Brazilian coast were considered as indicating a relative crustal stability. Accordingly the height of the Sangamon (?), Mid-Wisconsin and Postglacial deposits recognized in the present work are correlated with the Brazilian deposits. In the Salado basin, the deposits seem to indicate a relative subsidence, at least from the Mid-Wisconsin to the Postglacial transgression. In contrast, deposits of the Bahia Blanca estuary (northernmost part of the Colorado basin) indicate a broad uplift since the Sangamon (?) time. The deposits found in the other areas seem to indicate a relative coastal stability in the period spanning the Sangamon (?) to the present time.