Abstract: This study aims to investigate facies and microfacial properties of the Karaisalı Formation (BurdigalianAkitanian) cropping out in the northern and northwestern parts of the Neogene aged Adana Basin.The Karaisalı Formation is mostly composed of white-cream coloured massive reefal limestones withalga, coral, gastropod, lamellibranch, and echinoid. In the study area, three facies and nine microfacieshave been delineated based on geometry, lithology and fossil content. These facies and microfaciesrepresent: reef core (1- coralline framestone microfacies, 2- red algal- coralline bindstone/framestonemicrofacies, 3- foraminiferal- algal fragment bearing packstone/wackestone); reef front (4- large benthicforaminiferal- algal packstone microfacies, 5- Operculina packstone microfacies); back reef (6- small  benthic foraminiferal-algal packstone microfacies, 7- small benthic foraminiferal- algal wackestonemicrofacies, 8- bioclastic wackestone- mudstone microfacies, 9- local red algal bindstone microfacies)environments.