Calcareous nannofossil biostratigraphy and bio-events of the Coniacian–lower Campanian succession in the Kurdistan region, northeastern Iraq

The calcareous nannofossil biostratigraphy and bio-events of the Coniacian–lower Campanian succession are examined from the Dokan section, northeastern Iraq, along the southern Tethyan margin. In the Dokan section, calcareous nannofossils are affected by dissolution and silicification. The vertical stratigraphic distribution of calcareous nannoplankton allows identifying eight nannofossil zones (CC13/UC9 to CC20/UC15b). These calcareous...