Abstract

ISLA, Federico; DONDAS, Alejandro  and  TAGLIORETTI, Matías. Relict intrapampean dunes in Daireaux and Centinela del Mar, Buenos Aires. Rev. Asoc. Geol. Argent. [online]. 2010, vol.67, n.1, pp.58-64. ISSN 0004-4822.

The sediments informally called "pampeanos" are recognized as a package of silts and sandy silts deposited from the Upper Pliocene to Upper Pleistocene, interfingered with two transgressions to the east, discriminated by shells concentrations: the Interensenadan and the Belgranian transgressions. To the west of the Buenos Aires province, an extended area with dunes was called Sand Sea. Within channels excavated in Daireaux, and sea cliffs from Centinela del Mar, mesoscale crossbeding were described probing the presence of sand fields overlaid by silt deposits. Upper Pleistocene ages were confirmed by the assemblages of vertebrate remains. In Centinela del Mar, the age of these transverse dunes that are composing a littoral barrier was also confirmed in their relation to the maximum sea level highstand reached during the Sangamon interglacial (Upper Pleistocene; 120,000 years BP).

Keywords : Paleodunes; Upper Pleistocene; Western Buenos Aires; Centinela del Mar.

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