Abstract

FUCKS, Enrique E.; SCHNACK, Enrique J.  and  AGUIRRE, Marina L.. New stratigraphic order for the marine sequences of the continental sector from Bahia Samboronbóm, Buenos Aires province. Rev. Asoc. Geol. Argent. [online]. 2010, vol.67, n.1, pp.27-39. ISSN 0004-4822.

This study focuses on the relationships of the last two transgressive-regressive cycles that occurred in the Late Pleistocene and Holocene, and the lithological and geomorphologic developments on a terminal sector of the Salado-Samborombón river basins. Sealevel variations on a low-lying coast bordered by a higher terrain permitted the deposition of several sedimentary units, some of them preserving the morphology. Although this region has been broadly studied and because of the diverse existing nomenclature, it is necessary to designate and redefine the lithological units in order to establish a stratigraphic framework and its relationship with the geomorphic evolution of the area. Therefore, it is proposed to designate the Late Pleistocene transgressive maximum (MIS 5e) as Puente de Pascua Formation and the postglacial transgressive maximum as Canal de las Escobas Formation, with four members: Destacamento Río Salado, Canal 18, Cerro de la Gloria and Canal 15. This new stratigraphic organization includes sedimentological and palaeoecological criteria and their association with the regional morphological development.

Keywords : Marine transgressions; Geomorphic evolution; Bahía Samborombón; Lithostratigraphic units.

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