Biostratigraphy and paleoecology of Paleogen rocks based on calcareous nannofossil in Kafaz section, east Iran

In this study, the assemblage of calcareous nannofossils has been investigated in long and continuous deposits from a Kafaz section in Eastern Iran. A systematic study of calcareous nannofossils has indicated 39 nannofossils species. In order to the age determination of Kafaz's deposits, a revised zonation for the Eocene is used. Based on it, the Early-Middle Eocene deposits of Kafaz section is divided into 6 zones (NP11-NP16). Eventually, the Paleoecological applications of Eocene nannofossils are considered in this section. Three key factors which are mentioned as the main agents in controlling species distribution include surface water temperature, productivity and fertility. On the basis of three abundant species ( Zhgrhablithus bijugatus, Coccolithus plagicus and Sphenolithus moriformis), Early-Middle Eocene sediments of Kafaz section were deposited in an environment with high temperature, lower productivity and lower depth.