a "faulted corridor" that the ancient Aksu River cut through. In the period preceding the Messinian salinity crisis, when sea levels felling, there was a period of erosion where the river "buried" the canyon. It is filled with "Early Pliocene fluvio-marine deposits". Karadağ fan delta Located on the west side of the central part of the basin, the Karadağ fan delta (also called the Karadağ Conglomerates) dates from the Serravallian and Tortonian periods and is composed of "sandstones and gravels of limestones and ophiolitic rocks". The sources of these deposits are the Bey Dağları platform carbonates and the Antalya Nappes; for example, there are Upper Cretaceous Globotruncata fossils present in the fan delta. The gravels are "medium to poorly sorted", typically range from 3 to 8 cm in size, and are embedded in a "granule/coarse sand matrix". The base of the Karadağ fan delta is not visible because of tectonic activity since its formation. The overall thickness of the fan delta is about 750 m. Kargı fan delta The Kargı fan delta is located on the Aksu Basin's western side. It is composed of "NE-dipping thick conglomerates intercalated with thin mudstones with a total thickness of 185 m". Semi-rounded pebbles of limestone and ophiolite, generally ranging between 3 and 5 cm in size, are embedded in a "granule/coarse sandy matrix". Deposits in the Kargı fan delta contain "isolated piles of patch reefs" dating from the Tortonian period, primarily consisting of "columnar-shaped, thick-bedded, vertically growing Porites lobatosepta and Tarbellastraea siliciae colonies". In some places, there are "outsized blocks" of rock representing rock fall or rock slides, with the reef deposits underneath getting crushed in the process. Like the Karadağ fan delta, the Kargı fan delta was fed by the Bey Dağlari platform carbonates and the Antalya Nappes. Its growth mainly occurred in a north-northeast direction. According to Üner et al, the Kargı fan delta was probably formed as a "shallow braided stream and overbank deposit that developed on a medial alluvial fan". They write that, based on the "upper succession with patch reefs", the cause of the fan delta's formation was "a sharp transgression over the alluvial fan". Other fan deltas The Kapıkaya, Kozan, and Bucak fan deltas were all deposited approximately during the Langhian through Messinian periods. The Kapıkaya fan delta was fed from the northern end of the Aksu Basin; the Kozan was fed from the east side; and