The Bauru Basin covers an area of about 370.000 km2, occurring in Sao Paulo, Parana, Mato Grosso, Mato Grosso do Sul, Minas Gerais and Goias states in Brazil, and also in the northeast of Paraguay. These upper Cretaceous sequence correspond to a semi-arid to arid climate and is divided in two groups, Bauru and Caiua. The first one has the major record of fossils, being the focus of the taphonomic study. Field trips to Marilia and Monte Alto municipalities (Sao Paulo State) and also to Uberaba city (Minas Gerais State) were made to check the depositional context and collect fossiliferous material. Vertebrate collections were visited, as the Museu de Paleontologia from Marilia and Monte Alto (SP), Museu de Paleontologia da Universidade de Sao Paulo, as well as Museu dos Dinossauros, Centro de Pesquisas Paleontologicas Llewellyn Ivor Price from Peiropolis (MG). Four biostratinomic classes related to articulated/disarticulated fossils were identified in Vale do Rio Peixe, Uberaba, Marilia, Sao Jose do Rio Preto and Presidente Prudente formations. Class I represents articulated and almost complete specimens, corresponding mainly to turtles and crocodiles. Class ll comprises partially articulated specimens of skull and jaw fossils, or sequences of vertebrae. Classes I and II were recorded in Vale do Rio do Peixe, Marilia (Serra da Galga Member) and Presidente Prudente formations. Class III is represented by isolated bones, and Class IV by fragmented bones. These two last classes appear in all units of the basin. For diagenetic analysis, 19 thin sections were made showing that, in general, the bone structure is well preserved, with spatic calcite filling the bone and the presence of the original phosphatic material. Marilia Formation, on Echapora Member, is the most different unit of the basin, being more carbonatic. The study of thin sections, considering the osseous structure and the biostratinomic analysis, match with the paleoenvironmental contextualization.