Geology concerning the Piraçununga, SP, sheet

Abstract

The mapped area lies on the Est border of the Paraná Basin. It presents a strati graphic column formed by the Tatuí Group (siltite, daystone) and Corumbataí Formation (claystone), Pirambóia (sandstone) and Piraçununga (sand), beyond the diabase and quaternary sediments (sand, day). The Piraçununga Formation (Tertiary) and the diabase constitute mainly 70% of the total area. The Corumbataí Formation (Permian) cropsout the N-NE of the sheet, being covered by the Piraçununga Formation beside Rio Mogi Guaçu left bank, from Porto Ferreira to 252 km UTM coordinate. The Pirambóia Formation (Triassic) and the Tatuí Group. (Permian) are limited to N and SE area respectively. The quaternary deposits constitute the principal rivers alluvial plains, like Mogi Guaçu and Jaguari Mirim (Fig.1).