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 bullifer...

Triassic successions of the present-day Arctic contain abundant and diverse assemblages nonmarine palynomorphs that have provided important biostratigraphic information. Dinoflagellate cyst are biostratigraphically useful in marine intervals Upper Triassic. Based on published records, we present a compilation 78 last occurrences (LOs), first (FOs), some abundance events anticipated to correlati...