Many drills of the shelf and its periphery in the bar zone, where the most complete cross-section of the Upper Pleistocene sediments was established, underwent radiocarbon datings to determine the age of sediments (table 1). Probably they are lie over muds with Mediterranean fauna. New data of the Pleistocene terraces and the paleography of the Bulgarian Black Sea shelf.
The published results from the estimates of the absolute age of sediments on the coast and in the northwestern part of the shelf (Semenenko, Koyumdzhieva, Kovalyuh, 1976; Shterbakov et al., 1978) as well as in the deep valley of the Black Sea were also taken into account (Degens, Ross, 1972, Shimkus et al., 1976; Ross, Neprochnov, 1978; Dimitrov, 1978, 1982). On the basis of shells of Dreissena polymorha was estimated an age of 17 thousand years on the periphery of the shelf, at a depth of 102 m, in the layer of Neoeuxinian shelly detritus, under the base of Bugazian layers; that age probably reflects the period of the Post-Karangatian regression (fig. The age of fine aleurite silt with detritus and Vityazevian fauna found within the interval of 80—90 cm in drill 2345 was estimated at 6880 ± 260 years.
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