Abstract

ISLA, Federico; TAGLIORETTI, Matías  and  DONDAS, Alejandro. Revisión y nuevos aportes sobre la estratigrafía y sedimentología de los acantilados entre Mar de Cobo y Miramar, provincia de Buenos Aires. Rev. Asoc. Geol. Argent. [online]. 2015, vol.72, n.2, pp.235-250. ISSN 0004-4822.

The coastal cliffs of Mar del Plata are of the more complete localities of the Southamerican Quaternary, with significant differences in the stratigraphy between the northern and southern flanks. The Plio-Pleistocene record is composed by an almost uniform sequence of coarse silt and very fine sand transported to the area by eolian processes although the last imprint denotes very characteristic fluvial processes. Chapadmalal Formation is located at the toe of these cliffs and is overlapped by an extended caliche level that is the base of the fluvial deposit recognized as Barranca de Los Lobos, Punta Vorohué and Punta San Andrés units. To the top, Miramar Formation shows an increase in the gravity-dominated phenomena and transport of caliche pebbles. During the upper Pleistocene, the accommodation space had diminished towards the southern flank while to the north there was plenty of accommodation space for the aggradation of meandering rivers and the infilling of shallow lakes.

Keywords : Chapadmalal Formation; Miramar Formation; Stratigraphy; Sedimentary structures; Fluvial sequences.

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