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The coastal area of northern Patagonia, south of the Buenos Aires Province and north of the Río Negro Province, has littoral deposits related to different marine transgressions that occurred during the Quaternary. These marine deposits have been intensively studied from geomorphologic, stratigraphic and geochronologic standpoints, but paleontological investigations have been scarce. The main subject of this thesis is to study the paleodiversity of molluks and to characterize the paleoenvironment of the different transgressive episodes on the basis of the bivalves and gastropods using them as paleoenvironmental and paleoclimatic “proxies.” The study area was divided into four regions according to their geomorphologic features, three of them pertain to the south of the Buenos Aires Province (the Colorado River Delta, Anegada Bay, and Jabalí IslandVilla 7 de Marzo) and a fourth region to the north of the Río Negro Province (north of San Matías Gulf). A total of 84 localities were analyzed (31 Pleistocene, 29 Holocene and 24 modern) which include a collection of 7385 fossils, valves and shells, of 78 species (42 bivalves and 36 gastropods), among them, 11 species of micromollusks. This malacological paleodiversity was analyzed through descriptive statistical analyses. Two methods were used to determine marine faunal associations, Bray – Curtis and Correspondence analysis. The studied localities are marine deposits of the interglacials, from oldest to youngest, ≥ MIS 9, MIS 7, MIS 5e, MIS 1 and modern beaches. The oldest deposits were assigned to the Interglacial ≥ MIS 9 forming paleobeaches and beach ridges. All the deposits above 16 m msl were assigned to this Interglacial, discarding older events. To this Interglacial ≥ MIS 9 were assigned the deposits from localities (B1B2) currently 33 m msl, as well as localities (C1 C4) currently 16 18 m msl. In (B1B2) six species were recorded (two bivalves and four gastropods) being the bivalve Pitar rostratus the dominant species. In (C1 – C4) seven species (four bivalves and three gastropods) were recorded, among which the gastropod Buccinanops globulosus stands out. All the species from the Interglacial ≥ MIS 9 are represented in the modern coasts. The Interglacial MIS 7 (D1 D2) is represented by the paleobeaches currently located in the intertidal area, as coastal platforms, at 1-2 m msl. Eleven species were recorded (six

Caracterización paleoambiental y paleodiversidad malacológica en los depósitos marinos cuaternarios del norte patagónico (sur de Buenos Aires y norte de Río Negro)