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LITOESTRATIGRAFIA PRELIMINAR PARA OS DEPÓSITOS DE ENCOSTA DO QUATERNÁRIO SUPERIOR DO PLANALTO SE DO BRASIL (MG-RJ)

1980; Sociedade Brasileira de Geologia; Volume: 10; Issue: 4 Linguagem: Inglês

10.25249/0375-7536.1980258267

2177-4382

MOURA JOSILDA RODRIGUES DA SILVA DE, MEIS MARIA REGINA MOUSINHO DE,

Environmental and biological studies

A preliminary lithostratigraphy for the Upper Quaternary deposits of the Middle-Lower valley of the Paraíba do Sul river here tried, based on the systematic reproduction of some exposed sections. An special attention given to the slope materials, since the colluvial deposits are considered to be highly significative within the moist tropical environments. Three different colluvial sequences are heve identified: a) lower sequence, of Pleistocene age, is characterized by the occurrance of reddish, non-stratified colluvia which bear well developed soil structures; b) the middle sequence, dated approximately to the end of the Pleistocene and beginning of the Holocene, is constituted by yellowish, poorly stratified colluvia, bearingless significative secondary structures; c) the upper sequence, of Holocene age, is constituted by brownish-yellowish, poorly stratified colluvia. A first attempt to relate the geometry of the rock strata to the slope morphology is also tried. The validity of the present results is to be tested in the future, when more detailed data will be available.