Biostratigraphy of Cenomanian succession in Zagros area (southwest of Iran)

This study is focused on biozonation and biostratigraphic limits of two selected stratigraphic sections of the Sarvak Formation (Cenomanian) which are nominated Bavan and Kharameh (southwestern folded Zagros Mountain Ranges of Iran). Based on the vertical distribution of benthic and planktonic foraminifers, one biozone in Bavan area and three biozones in Kherameh stratigraphic section have established which are: Chrysalidina gradata-Cuneolina pavonia Assemblage zone (Upper Cenomanian) in Bavan section, and established biozones in Kherameh stratigraphic section from the base to the top consist of: 1) Praealveolina iberica-Praealveolina pennensis Assemblage zone (Lower Cenomanian), 2) Nezzazata conica-Nezzazata simplex Assemblage zone (Middle Cenomanian), 3) Calcisphaerula innominata-Heterohelix reussi-Heterohelix moremani Assemblage zone (Upper Cenomanian). New micropaleontologic data confirms well diversified and expanded of imperforate foraminifera in both studied stratigraphic sections. Well developed planktonic foraminifers in Kherameh stratigraphic column reflect transgression of sea-level rise during Upper Cenomanian.