Calcareous Nannofossils Biostratigraphy of the Gurpi Formation At the Bavan Section, Northwest Shiraz

Using calcareous nannofossils is a powerful way for biozonation in sub-stage level، especially in the Late Cretaceous and Cenozoic، because they are planktonic، cosmopolitan، abundant and have very short age. Considering lack of any precise paleontological studies about the Gurpi Formation in the NW of shiraz (Bavan)، nannofossils chose to investigate. This Formation consists of shale، marl and limestone. In this study، 23 genera and 46 species of nannofossils were identified. According to the identified marker species، 14 biozones were diagnosed that classified as CC14-CC26 and NP1 (Base of the Pabdeh Formation). According to these biozones، it has been suggested that this section is aged of the Gurpi Formation from Early Santonian to Danian. The existence of CC26-NP1 zonal marker species of the K/T boundary has been considered which indicates continuous sedimentation from the Late Cretaceous to Early Paleocene.