This book presents the results obtained during geoarchaeological studies carried out in the locality of Touro Passo, municipality of Uruguaiana, Brazil. There, the Paleoindian sites studied by the team of the PRONAPA-National Archaeological Research Program in the 1960s and 1970s were relocated and others with excellent study potential have been recognized. The archaeological sites are located in the alluvial plains of the Uruguay River and the Touro Passo Stream and correspond to the late Pleistocene-early Holocene transition. The geoarchaeological approach allowed the understanding of the stratigraphic sequence and the processes of formation and post-depositional disturbance of the archaeological sites in a fluvial environment. Archaeological excavations, soundings, stratigraphic profile surveys, sequence correlations and numerical dates were carried out. The dispersion of artifacts on the surface and cave erosion was recorded, and a lithic taphonomy study was carried out. Four Paleoindian sites located in the Touro Passo Formation were analyzed: Barranca Grande, RS-I-66: Milton Almeida, RS-I-69: Laranjito and Casualidade. The new chronologies obtained for the initial period of human occupation in the region represent a scientific advance for the study of hunter-gatherer occupations during the Late Pleistocene-Early Holocene in the triple border of Brazil, Argentina and Uruguay. | Este libro presenta los resultados obtenidos durante los estudios geoarqueologicos realizados en la localidad Touro Passo, municipio de Uruguaiana, Brasil. Alli se reubicaron los sitios paleoindios estudiados por el equipo del PRONAPA-Programa Nacional de Investigaciones Arqueologicas en las decadas de 1960 y 1970 y han sido reconocidos otros con excelente potencial de estudio. Los sitios arqueologicos estan situados en las planicies aluviales del Rio Uruguay y del Arroyo Touro Passo y corresponden a la transicion Pleistoceno tardio-Holoceno temprano. El enfoque geoarqueologico permitio la comprension de la secuencia estratigrafica y los procesos de formacion y perturbacion postdepositacional de los sitios arqueologicos en ambiente fluvial. Fueron realizadas excavaciones arqueologicas, sondeos, relevamiento de perfiles-estratigraficos, correlaciones de secuencias y fechados numericos. Se registro la dispersion de los artefactos en superficie y en las carvavas de erosion, y se realizo, un estudio de tafonomia litica. Se analizaron 4 sitios paleoindios situados en la Formacion Touro Passo: Barranca Grande, RS-I-66:Milton Almeida, RS-I-69: Laranjito y Casualidade. Las nuevas cronologias obtenidas para el periodo inicial de ocupacion humana en la region, representan un avance cientifico para el estudio de las ocupaciones cazadoras-recolectoras durante el Pleistoceno tardio-Holoceno temprano en la triple frontera Brasil, Argentina y Uruguay.