Relations between paleopedogenetics and sedimentary processes in Marília formation of the Echaporã Saw (Bauru Group, Upper Cretaceous)

Paleosols are represented by a geological body that is found in sedimentary successions and corresponds to a buried ground covered by rocks or other newer paleosols. The Marília Formation (Bauru Group) is composed of a relevant portion of paleosols profiles, in some outcrops of paleosols the thickness exceeds 95% of the sequence. Switching between paleopedogenetics and sedimentary processes were fundamental in the development of paleosols. This research aims to make paleoenvironmental interpretation of the upper portion of the Bauru Group in the area of the cities of Marilia and Echaporã the state of São Paulo, analyzing the builders factors of geological bodies. During fieldwork for the identification and description of the structures of paleosols, horizons, roots traces, mottling. sedimentary structures of absences. The sediments were identified by the presence of sedimentary structures. Geochemical laboratory made it possible to characterized the different types of horizons as Bw, Bk and Btk, provenance, hydrolysis, calcification and leaching. The analyzed profiles indicate conditions in an environment with semiarid climate, with little vegetation. Some profiles are few developed and have few incipient structures, others have more obvious structures and contains a good level of development, in all. The paleoenvironment is identified as desert, with semi-arid climate, characterized by temporal cyclical alternation between unconfined underwater (AU)