The Itajaí, Corupá, Campo Alegre, Guaratubinha, Camarinha and Castro basins are the most important register in the northern half of southeastern Brazil of geological events wich occurrec at the end of the Neoproterozoic and beginning of the Cambrian. The Itajaí and Camarinha basins are thought to be foreland basins while the rest are late-collision extensional basins. The volcanisir in these basins is related in time and genetically to the alkaline-peralkaline magmatism of the Serra dc Mar Suite. The main phase of basin installation is related to extensional events which separate twc compressive phases at the end of the Proterozoic (~ 650-600 Ma) and the beginning of the Cambrian (550-530Ma).
