The shallow-marine Eocene Soğucak Limestone and Oligocene Ceylan Formation were studied in the northern and eastern parts of the Thrace Basin with detailed biometric analysis of the full spectrum of larger benthic foraminifera (mainly nummulitids and orthophragmines). | Stratigraphy and larger foraminifera of the middle eocene to lower oligocene shallow marine units in the northern and eastern parts of the Thrace Basin, NW Turkey