Structural, textural, mineralogical and chemical datas of two lateritic profiles located in Paragominas municipality, in the NE of Pará State, are studied. The profiles with three horizons: lower, intermediate and upper that correspond, respectively to massive lateritic crust, fragmented crust and soil, are formed by the weathering of the crust in wet climate with rain forest. In these conditions the lateritic crust form the top latosol by the lost of aluminiun and iron as consequence of the dissolution of the gibbsite and hematite. The aluminium was combined with silicon fprming kaolinite that acumulated in the top of the profile forming an in situ latosol. At the same time the hematite is hidrated forming goethite giving the yellow color of the latosol.
