Microbiostratigraphy of Gurpi Formation at Zangol Anticline and comparison with the Kohe Siya section, Assaluyeh section and Ivan well

In order to determine the accurate microbiostratigraphy and bathymetery conditions of the Gurpi Formation, one stratigraphic section was studied at the Zangol anticline (SW of Khorramabad). On the basis of the recognized foraminifera, the age of the Gurpi Formation in the studied section is assigned to the Late Santonian to Middle – Late Maastrichtian In this study 35 species belonging to 15 genera of Planktonic foraminifera were idientified that result in determination of 8 biozone were reported as follows: Dicarinella asymetrica Zone, Globotruncanita elevata Zone, Globotruncana ventricosa Zone, Radotruncana calcarata Zone, Globotruncanella havanensis Zone, Globotruncana aegyptica Zone, Gansserina gansseri Zone, Contusotruncana contusa Zone. Study of the morphotype groups of Planktonic foraminifera represents an increase in depth marine condition for deposition of the Gurpi Formation less than 50 meters to more than 100 meters at the study area.