Palynology and geochemistry of the Frasnian global transgression in the Parnaíba Basin, Brazil

An integrated palynological and geochemical approach has been initiated to date precise the events of Pimenteiras Formation, in Late Devonian from Parnaíba Basin, Brazil. Based on good biostratigraphic markers presence index species among miospores, acritarchs chitinozoa, investigated sequences are referred Middle early Frasnian. Among Miospores, Chelinospora concinna Verrucosisporites bulliferus likely be BPi Interval Zone defined Amazon Basin. Chitinozoans Early Frasnian Angochitina (Lagenochitina) avelinoi zone Basin present, acritarch assemblages also consistent with a age, by comparison previously described other Brazilian basins. Some important accompanying palynomorphs illustrated. In studied outcrops, black shale intervals top Radioactive Sale B Shale C according Rodrigues (1995) definitions. Top shows concentration terrestrial organic matter, but low potential source gas. By upper part marine matter have high as gas condensate. This study that progressive flooding took place during period maximum transgression These global interest for hydrocarbon exploration, regarded Gondwanan regional chronostratigraphic correlations.