The Paraná Basin is a typical intra-cratonic flexural basin, although during the Paleozoic it was a gulf that opened to the southwest. The basin genesis is related to the convergence between the former Gondwana supercontinent and the oceanic crust of the former Panthalassa ocean. The basin formed, at least during the Paleozoic orogenesis of the Gondwanides, a foreland basin.[1][2][6]