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The Tatui Formation, one of the Brazilian Parana Basin geological units, is developed solely in the State of Sao Paulo, southeast Brazil. It is studied herein, through outcrops at the eastern border of the basin, which are siltstones and fine sandstones, interbedded with some coarse and conglomeratic sandstones. Published papers on its fossils are sparse, dealing with some groups but not involving the entire association. This paper deals with ichnofossils, arthropods (conchostracans, isopods, and indeterminate crustaceans), plants (pteridophytes and spermatophytes) and fish remains (scales and teeth of Actinopterygii and Sarcopterygii). Foraminifers and sponge spicules were reported in short communications without illustrations and from uncertain stratigraphic positions. The Tatui Formation paleoenvironmental deposition evolved through three phases. The first contains only the euryhaline fossils in siltstone beds. The second phase is regressive, with continental fossils (conchostracans and plants) in massive or laminated siltstone beds and conglomerates. The third stage is transgressive with hummocky cross – stratification in sandstone and increasing salinity. La Formacion Tatui (Permico Temprano, Cuenca del Parana), Brasil: Consideraciones paleontologicas y paleoambientales Resumen La Formacion Tatui es una unidad litoestratigrafica de la Cuenca del Parana que aflora exclusivamente en el Estado de Sao Paulo, Brasil. En su borde nororiental esta formada por limolitas y areniscas finas que poseen intercalaciones de areniscas gruesas y conglomeraticas. Este trabajo caracterizo en esta formacion diversas evidencias de fosiles: huellas,  artropodos (conchostracos, crustaceos isopodos e indeterminados), vegetales (helechos y fanerogamas) y restos de vertebrados (escamas y dientes de Actinopterygii y Sarcopterygii). Foraminiferos y espiculas de esponjas fueron reportados en comunicaciones breves, entretanto, sin estar acompanado de ilustraciones y de sus posiciones estratigraficas. Tres fases de deposicion permiten reconstruir el paleoambiente de la Formacion Tatui. En la primera fase hay presencia solamente de fosiles eurihalinas en limolitas. En la segunda fase, fosiles continentales (conchostracos y vegetales) que estan presentes en camadas limoliticas masivas o laminadas y en conglomerados vinculados a una etapa regresiva. Finalmente, la tercera fase se caracteriza por una etapa transgresiva con la presencia de estratificacion cruzada “hummocky” y aumento de la salinidad.

The Tatuí Formation (Early Permian, Paraná Basin), Brazil: Paleontology and Paleoenvironmental Considerations