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
Western Thrace of multiple ethnic groups. However, Recep Tayyip Erdoğan, during his historic December 7, 2017 visit to Greece as President of Turkey, acknowledged for the first time the multi-ethnic nature of the Muslim minority. The last censuses which asked about ethnicity were held in the transitional period before the region became part of Greece. A number of estimates and censuses during the 1912-1920 period gave the following results about the ethnic distribution of the area that would become known as Western Thrace: The Pomak population depending on the source was sometimes counted together with the Turks (Muslims) following the Ottoman system