“…The Permian-Cretaceous Guarani Aquifer, a.k.a. Mercosul Aquifer (Araujo et al, 1999), has an average thickness of 300-400 m. It is composed by the Piram bóia-Botucatu succession, which comprises sandstones and sandy-siltstones (Donatti et al, 2001). The Botucatu eolian system overlies the fluvio-eolian deposits of the Pirambóia system.…”