(AGI) Istanbul, Aug 22 - A 4th century BC mosaic was unearthed at an excavation site managed by the University of Osmaniyein in the Adan province in southern Turkey. The mosaic, which measures some 8 metres in diameter, depicts the Greek sea god Poseidon and extends over a large area in what was the "frigidarium", or cold water pool, of an ancient bath where the Roman city of Aegeai once stood. It was not the first such discovery in the region. The Hatay Archaeology Museum in Antakya and the recently inaugurated Zeugma Mosaic Museum in Gaziantep hold a vast collection of Roman and Byzantine mosaics. (AGI). .