Re-evaluation and correlation of the Oligocene foraminiferal biozones in the eastern Zagros Basin, SW Iran

This study reconsiders the previous biostratigraphic settings for Asmari Formation in eastern Zagros Basin (Fars Basin). The results imply that Rupelian is identified by total range zone of Nummulites species (N. vascus, N. fichteli, intermedius). occurrence Archaias kirkukensis, A. hensoni, and asmaricus before disappearance current even co-occurrence hensoni with mentioned prevents use recently proposed regional stratigraphical framework. lower part remains without certain age until larger benthic foraminifera throughout platform. coeval biozones Chattian Stage are Biozone 59, 2(b), asmaricus-A. hensoni-Miogypsinoides complanatus Assemblage Zone, a Zone 7 as named studies. In this like Archaias, Austrotrillina, Borelis Peneroplis not useful discriminating stages.