Stratigraphy of the sediment infill in Bosphorus Strait: water exchange between the Black and Mediterranean Seas during the last glacial Holocene

The sediment infill over the Paleozoic bedrock in the Bosphorus Strait consists of four sedimentary units which were deposited in the last 26,000 super(14)C years B.P. The stratigraphy of these units suggests that this part of the Bosphorus was a freshwater lake between 26,000 and 5,300 super(14)C years B.P., depositing sands with a freshwater mollusc fauna of Black Sea neo-euxinian affinity (Dreissena rostriformis, Dreissena polymorpha, andMonodacna pontica). The first appearance of euryhaline Mediterranean molluscs (e.g.,Ostrea edulis, Mytilus edulis) was observed at 5,300 super(14)C years B.P. in this part of the Bosphorus. Deposition of coarseMytilus-bank andOstrea-bank units suggests that the establishment of the present dual-flow regime in the Bosphorus took place at about 4,400 super(14)C years B.P.