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Stratigraphical interpretations related to sedimentary age, environmental features and boundary relationships of the Tertiary marine clastics cropping out around the Direkli, Dandire Villages, south of Isparta, are still discussed. Nannofossil species and biozones were recognized in the fine and/or coarse-grained rock samples of the Tertiary marine elastics which had been asserted to be a complete unit of the Miocene age in some studies of the investigated area though accepted to be composed of the two geological units of which the north part is Eocene-aged and the south part is Miocene-aged in some other studies. According to distribution of generically distinguished synsedimentary, intrabasinal or extrabasinal reworked nannofossil assemblages of examined representative rock samples, new stratigraphical and sedimentological interpretations were made on sedimentary age and environmental features of the succession. Nannofossil data show that the rocks of the succession indeed deposited during the late Late. Oligocene and Early Miocene period, represented by the NP25-NN3 nannoplankton zones; however, the data particularly of the NP25 zone were completely transferred to the Early Miocene sedimentation by intrabasinal reworking. In the investigation area, a general open/shallow marine and regresive structure of which the sedimentary succession shows is also supported by an abundance of intra- and extrabasinal nannofossil records. Therefore, generally to be mainly found intrabasinal reworked nannofossils may indicate to a synchronous tectonic activity (subsidence) on the sea floor with the sedimentation. [ABSTRACT FROM AUTHOR]