Thrace Basin Thrace Basin The European side of Turkey is called the Thrace Basin. It is the largest and thickest Cenozoic sedimentary basin in Turkey. The basin is triangular shaped, trends WNW-ESE and was formed by extension in late Middle Eocene to latest Oligocene times. This gas prone basin is located northwest of Istanbul, Turkey. About 9,000 meters of Eocene-Miocene marine clastics and continental sediments were deposited. Several basement faults were reactivated and underwent strike-slip motion in late Miocene times where the famous North Anatolian Fault bounds the southern part of the basin. The Cenozoic sedimentary succession, overlying Paleozoic to Mesozoic metamorphic
Turks of Western Thrace which had been victorious in the First Balkan War. France occupied the area at the end of the First World War, following the defeat of Bulgaria, and it passed into Greek hands under the Treaty of Sèvres in August 1920. Under a protocol of the same year, the Turks of Western Thrace were exempted from the 1922-1923 exchange of populations agreement between Greece and Turkey and were granted rights within the framework of the Lausanne Treaty. However, since 1923, between 300,000 and 400,000 Turks have left Western Thrace most of which have immigrated to Turkey. It should be emphasised that