Biostratigraphy and paleoecology of Abderaz Formation in Chahchaheh section, East Koppeh Dagh based on Ostracods

In the present study the Abderaz Formation ostracods were investigated. The thickness of the formation in this section is 385m, and consists of shale and marl together with three horizons of chalky limestone. Paleontological studies led to identification of 16 genera and 51 species of ostracods and differentiation of four biozones in this section. According to the ostracods and correlation with calcareous nannofossils in this section, an age of late Santonian to early late Campanian is quoted to the formation at this section. Presence of warm water index species and absence of cool water forms suggest warm surface waters. Also changes in depth and oxygen were concluded during depositional course of the formation.