Abstract: The purpose of this study is to investigate the environmental features and stratigraphy, with ostracodefauna, of Tertiary sequence Karsantı Region (NNE Adana)In this study, 31 Ostracode genus, 5 subgenus and 31 species have been «identified from the Oligocene-Mddle Miocene age of detritic units cropped out the region. Neomonoceratina helvetica-Aurila soummamensis Zone,Gökçen (1984) has been defined from the Burdigalian-Lower Langhian by using of these species. This zone has been correlated within the previously-studied Tethys-Paratethys regions and with contemperary sequences deposited in Turkey.According to the ostracode fauna, various deposition environments that Early Oligocene is shallow marine, LateOligocene is continental/transition and Burdigalian-Early Langhian has shallow marine features are indicated fromOligocene to Early Langhian in the study area.