Abstract: Rock units of Upper Jurassic, Paleocene, Eocene and Neogene age crop out 10 km south of Polatlı. Limestones of Çaldağ Formation are definitely of Upper Jurassic age with Protopenoroplis striata Weynschek, LabyrintJiinasp. and Olypeina jurassica Favre. Kartal Formation ojf Lower Paleocene (Montian) age overlies uncomformably ÇaldağFormation, It is composed of conglomerate, lacustrine limestone, sandstone and lignite of laminations, which are deposited in delta enviroment. The marine limestone of the Upper part of Kartal Formation contains Rotalia trochidiformis Lamarck, Mississippina binkhorsti (Reuss) and Distichoplax biserialis (Dietrich). Kirkkavak Formation overlies uncomformably (?) the Kartal Formation. It is composed of sandstone, limestone and marls of Middle Paleocene (Thanetian) agewith Alveolina (G-lomalveolina) primaeva Reichel and Renz and Discocyclina sewnesv Douvilla at bottom. The upper partand the top of Kirkkavak Formation ise composed of sandy and clayey limestone, marls of Lower Ilerdian age with Nummulites solitarius de Lstf Harpe, N. eodlis Douville, Alveolia cucimijormis Hottinger and A. ellipsoidalis Schwager; MiddleIlerdian with RanikothaUa couisensis (d`Archiac) and Upper Ilerdian with Ranikothalia nuttalli (Davies) and the otherforaminifers. Eskipolatlı formation overlies uncomformably the Kirkkavak Formation and is composed of conglomerate,sandy and clayey limestone, sandstone and marls. The lowest levels o|f Eskipolatlı Formation is of Lower Cuisian age withNummulites planulatus (Lamarck) and Alveolina oblonga (d`Orbigny). The upper levels of this formation is of MiddleCuisian age with Alveolina canavarii Checchia ve Rispoli, A. lehn`eri Hottinger and the other foraminifers. Six new speciesof Alveolina are also established.