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The Itaqueri Formation, Cenozoic, is located in Itaqueri’s Hill, Southeast of Brazil. It is composed by sediments deposited in environment of alluvial fans under semi-arid conditions. The remains of morphotectonic and paleopedological features in the area characterize a complex evolution that involves important climate changes, different episodes of tectonic motion and different positional events. The analysis of sediments and paleosoils indicates two events of deposition of alluvial fans alternated by periods of climate more humid in which developed two alteration profiles. The first profile developed a thick Ultisol (US Soil Taxonomy) in the sediments associated to the first depositional event that was subsequently reached by a silicification process. The second profile developed a very thick lateritic feature in the sediments associated to the second depositional event. The analysis of alteration profiles and paleosoils indicates three geomorphic surfaces in the area: the first associated to basal deposits of Itaqueri Formation wich truncated the Botucatu Formation and Serra Geral Formation; the second associated to the development of soil wich were silicified later; and the third associated to development of a lateritic profile. A distinctive erosional unconformity separates both materials. Cenozoic tectonic motions uplifted and lowered the area successively which implied relief inversion, partial destruction of the sediments and paleosoils, and exposures in different altitudes along the area.

O USO DE PALEOSSOLOS E PERFÍS DE ALTERAÇÃO PARA A IDENTIFICAÇÃO E ANÁLISE DE SUPERFÍCIES GEOMÓRFICAS REGIONAIS: O CASO DA SERRA DE ITAQUERI (SP)