Abstract
The Serra Geral Formation in the Araçatuba region, northwest of São Paulo State, Brazil, crops chiefly in the Tietê river valley and it's affluent. In a drilling of a well to get water in the subsurface it was possible to observe and sample a sequence of 980m represented by 27 lava flows, which individual thickness vary from 10 to 84m. Besides it 9 samples were collected in the surface from 3 deactivated quarries and in the Baguaçu river bed. Some of these rocks were analyzed and geochemical data show that they represent tholeiitic basalt of high-Ti type with TiO2 concentration between 1,77% and 3,66% and that may be divided into two distinct sub types, named Pitanga and Paranapanema. The first type is enriched in Nb (8%), K (9%), La (11%), Ce (18%), P (8%), Nd (20%), Zr (19%),Sm (17%), Eu (15%) and Ti (15%) in relation to the second. In the samples of the drill hole basalt of the Pitanga and Paranapanema types alternate themselves and the first group is in contact with the sandstones of the Botucatu Formation in a depth of 980m following until 748m in a succession of 5 lava flows. Since then begin a new sequence of 10 flows of Paranapanema type until the deep of 396m followed by three lava flows of Pitanga type basalt until 268m. From the last point until the surface a sequence of 9 flows of the Paranapanema type is observed
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