الملخص

Ostracoda assemblages have been studied from Fat'ha Formation (Middle Miocene) at SW limb of Bazian anticline, Sulaymaniyah,Kurdistan region, Iraq.  The Paleoecology of ostracoda assemblages points to shallow marine water that changes to barrier lagoon water setting due to tectonic activity event. The application of statistical analysis (Simpson index) leads to the subdivisions of Fat'ha Formation into five ecozones in the studied area.