Contribution to the subsurface geology and paleontology of the Tubarão Group in the state of São Paulo

Abstract

The well drilling to get ground water supply in the State of São Paulo, Brazil, through the cooperation of the Geological Institute (Ex-Instituto Geográfico e Geológico) led not only to new stratigraphic data but also to paleontological observations which enlarged broadly our knowledgment about the geology concerning Tubarão Group on the State of São Paulo. In this paper geological profiles are assigned to Sarapuí wells (two, depth: 138 m and 130 m), Itu (four, depths: 81 m, 87 m, 100 m and 134 m), Salto de Pirapora (one, depth: 119 m). In the three former localities the wells cut only Tubarão Groups sediments, and the two latter have reached the São Roque Embasement rocks. In the Sarapuí wells were found the following fossils: in the n.º 1 plant remnants and fragments (mainly stems many thoroughly carbonzied and few not yet been and besides that we found Lagenoisporistes (Trileites) brasiliensis (Dijkstra 1955) Trindade, megaspores. In the nº2 there are several carbonized (party and thoroughly) plant fragments and rernriants asd ?Plumsteadiella sp