Lithostratigraphy and Biostratigraphyo of Ilam Formation in North Flank of Pusht-e-jangal Anticline in lorestan

This study have aimed to recognize the planktonic foraminifera and their morphotype in Ilam formation and categorize them according to their living depth .The sea level changes in basin and time of depositon of ilam foemation has been suggested and also compared with its global changes. According to the microfacies the homocline ramp has been suggested for ilam formation. The planktonic foraminifera of Ilam Formation at this section led to recognition of the 16 genera and 25 species of pelagic foraminifera and oligosteginid¡ and three biozones as below : 1) Dicarinella asymetrica Total Rang Zone
2) Globotruncanita elevate Partial Rang Zone
3) Globotruncana ventricosa Interval Zone
According to this study, the suggested age for Ilam Formation in this section is Late Santonian _ Early Campanian.