Abstract
The Bauru Basin, an Upper Cretaceous sedimentary basin in the southeastern South American Plate, has been studied since the end of 19h Century. In the north and northeast region the investigations were concentrated mainly near the city of Uberaba, due to the large fossil and limestone deposits economically explored there. Based on recent surface and subsurface data, an integrated stratigraphic analysis of the Bauru Group was developed in the Triângulo Mineiro region and extending to the neighboring areas in the northeast of Mato Grosso do Sul, south of Goiás, and north of São Paulo states. This analysis allowed the construction of a paleogeographic evolution model, based on five depositional environments that composed an alluvial/lacustrine systems tract. The alluvial sedimentation entered the basin towards the lacustrine base level (Gurinhatã, Limeira D'Oeste, Prata and western Sao Paulo region) from the northern/northeastern catchment area (Alto Paranaiba Uplift and Goiás Alkaline Province). After Cretaceous sedimentation ended, the Triângulo Mineiro region was modified by Tertiary tectonic events, which resulted in the formation of various depressions, where remnants of the Bauru Group are preserved. Based on these data it was possible to make the paleogeographic model to the Bauru Basin and to establish the relationship with the Late Cretaceous South America paleogeography.
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