Biostratigraphy of Campanian - Maastrichtian & Danian on the based of plankton foraminifera in Galanderud area, northern flanks of Alborz mountains

In central Alborz Mountains in north of Iran, a new Cretaceous-Tertiary boundary (K/T) section near Galanderud Mine in Mazandaran province reveals diversity of planktonic foraminiferal the fauna similar to those found in ElKef & Elles in Thunisia. The Cretaceous-Tertiary boundary is located by planktionic foraminifera with in a narrow interval bounded by last appearance of tropical and subtropical Cretaceous species and first appearance of small Tertiary species. In Galanderud section only 5 species survived after the Cretaceous-Tertiary boundary event and 31 species of Cretaceous became extinct in or before Cretaceous-Tertiary boundary. The Maastrichtian species that seem to died out gradually are generally large and cosmopolitan.