Thrace Basin basement, comprises interbedded fine to coarse grained clastics from a variety of depositional environments, turbidite, muddy carbonates with local reef developments, river channels and tuffs. More than 400 wells were drilled till 2008; 14 gas and 3 oil fields were discovered and all of them are producing. Main gas productions zones are between Eocene- Oligocene deposits; Hamitabat (turbiditic sandstones), Ceylan (tuffs), Sogucak (reefal limestone), and Osmancik (deltaic sandstone) formations. Shales of Hamitabat and Mezardere formations have good source potentials. Thrace Basin The European side of Turkey is called the Thrace Basin. It is the largest and thickest Cenozoic sedimentary basin
Minorities in Turkey of Greek and Greek-speaking Eastern Orthodox Christians who mostly live in Istanbul, including its district Princes' Islands, as well as on the two islands of the western entrance to the Dardanelles: Imbros and Tenedos ( and "Bozcaada"). Some Greek-speaking Byzantine Christians have been assimilated over the course of the last one thousand years. They are the remnants of the estimated 200,000 Greeks who were permitted under the provisions of the Treaty of Lausanne to remain in Turkey following the 1923 population exchange, which involved the forcible resettlement of approximately 1.5 million Greeks from Anatolia and East Thrace and of half