Abstract
Rio Ivaí Group consists of three Formations: Alto Garças, Iapó and Vila Maria. The main outcrops of this group, in the north flank of the Paraná basin, are in a narrow belt with approximately east-west direction. This belt stretches approximately 150 km in cliffs of hills and in waterfalls, where one can find the type-section; supplementary type-section in the Aldeia creek; and the Três B…