Abstract: In this study, paleontological and biostratigraphic characteristics of the Paleogene geologic unitsoutcropping between Kuscu and Macun villages located around Temelli district, Polatli, Ankara. We haveexamined the patterns of Pelecypoda and Gastropoda samples. Seven measured stratigraphic sectionfrom the west of Macun village to east of Kuscu village, which contains the Pelecypoda and Gastropodapatterns, reach total thickness of 52 metres. As a result of field studies, seven species belongs to class ofPelecypoda and one of the new sixteen species belongs to class of Gastropoda have been described. Considering paleogeographic distribution and biostratigraphy of described fauna, it is quite proper topropose that they represent Thanetian age and can be interpreted as belonging to Kırkkavak Formation.Furthermore, the paleoecologic characteristics of the fauna strongly suggests that the shallow andtemperate coastal marine facial conditions were prevalent at the region during that time span.