Abstract: In this study, a total of 300 samples either collected from 13 measured sections or as spot sample from 7 stratigraphic horizons have been investigated for their ostracoda assemblages. 22 species, 11 of which already known, eight yet unnamed, 2new species and 1 new subspecies belonging to 8 brackish and freshwater genera have been identified.Five different ostracoda biozones have been recognized considering the stratigraphic and geographic distribution of ostracoda fauna in the measured sections. These are from bottom to top: Zone AI- Cyprideis pannonica-Cyprideis torosa Zone, ZoneAll- Limnocythere sp.l-Paralimnocythere sp. 2 Zone, Zone Alll-Cyprideis sp.l Zone, Zone AIV-Cyprideis tuberculataCyprinotus salinus Zone and Zone AV-Xestoleberis sp.-Cyprideis sublittorallis Zone. Zones AI, All, AIII and AIV are characterized in the Pannonian stage but Zone V in the Pontian stage.The results are both correlated and supported with the other fauna and flora groups (benthic foraminifera, microvertebrate,microgastropoda, spors and pollens) which confirm the identification and separation of Pannonian (Early, Middle, Late) andPontian stages in the studied material.