Republicação da “Carta Geomorfológica de São Pedro, SP – 1:50.000” e memo-rial explicativo, originalmente publicado em “Sedimentologia e Pedologia”, número 12, pelo Instituto de Geografia, Universidade de São Paulo, São Paulo, em 1978. Pes-quisa desenvolvida no âmbito do Convênio entre o Laboratório Pedologia e Sedimen-tologia do Instituto de Geografia da USP / Departamento de Geografia da Faculdade de Filosofia, Letras e Ciências Humanas da Universidade de São Paulo e o Centre de Géomorphologie du CNRS sob a coordenação de J.P. Queiroz Neto e A. Journaux.

Republicação da “Carta do Modelado e das Formações Superficiais do Médio Vale do Rio Parateí, SP – 1:25.000” e memorial explicativo, originalmente publicado em “Sedimentologia e Pedologia”, número 9, pelo Instituto de Geografia, Universidade de São Paulo, São Paulo, em 1978. Pesquisa desenvolvida no âmbito do convênio entre o Laboratório de Pedologia e Sedimentologia do Instituto de Geografia / Departamento de Geografia da Faculdade de Filosofia, Letras e Ciências Humanas da Universidade de São Paulo e o Centro de Geomorfologia do CNRS - Caen, sob a coordenação de J.P. Queiroz Neto e A. Journaux.

Three-dimensional organization of a pedological cover, comprising study of the geometrical relationship between horizons and, in particular, concordance/discordance relationship makes it possible to reproduce certain steps of a landscape development. The studied slope, in the humid tropical zone (Atlantic Brazil), shows a very thick latosolic cover (> 10 m) with subhorizontal horizons upslope. The upper part of this cover is intersected by a thinner pedological differentiation which corresponds to the present day topography. The latter has developed, along the slope, throughout the successive horizons of the thick latosolic cover down to the depth of the substratum. When the substratum is reached, lithodependant soils develop successively on sandstones, siltstones and sandy clays of the Tubarao Formation (Permo-Carboniferous). This discordance between the superficial differentiation and the horizons of the latosolic cover suggests that the former is more recent than the latter. Further downslope a thick cover reappears which may be related to the one found upslope, by means of the study in the horizontal plane. Considering that the geometry of this latosolic cover (limits between horizons and between soil and saprolite) is approximatively parallel to the surface topography which occurred at the time of its formation, we may reconstitute the past topography. The reconstitution seems to show that present topography is partially embedded in the past topography. Key-words : Ferrallitic soils, landscape development, geometrical relationship between horizons, Brazil.

Cette étude a pour but d'éclairer le choix des communes entre l'assainissement individual and common draining of waste water. documents préalables, dont la carte des contraintes, tenant compte de la perméabilité du sol. de l'épaisseur des formations superficielles, de la pente du terrain, etc. Dans une deuxième étape, une carte à 1/50 000 est établie, permettant de distinguer les zones où Vépandage souterrain des eaux usées est interdit, possible sous certaines conditions, ou autorisé. Dans une troisième étape, une carte à 1/5 000 est dressée dans les seules communes où l'assainissement individuel peut être pratiqué ; elle sert alors de document d'urbanisme.

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