Changes in the Ostracod Assemblages of the Northeastern Black Sea Shelf during the Late Pleistocene and Holocene

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Abstract
Distribution of 57 ostracod species is investigated in the Quaternary sediment samples from the borehole RBH-16, drilled at the north-eastern Black Sea shelf edge off the town of Anapa. Among them, 52 species of the Caspian type and 5 species of the Mediterranean type were found. Four distinct assemblage zones are identified: the Caspian type one typical for Chaudian basin (Early Neopleistocene) (I) in interval 15.55–14.11 m; the Caspian type one dominating from the Late Pleistocene to the early Holocene (II), according to species composition closed to Khvalynian basin, at the depth 13.4–3.84 m (from 13.6 to 8.7 cal. ka BP), the mixed one of Caspian type and Mediterranean type species (III) in interval 3.84–0.95 m (younger than 8.7 cal. ka BP), and the assemblage with progressively increasing dominance of Mediterranean species (IV) in interval above 0.75 m (after 7.4 cal. ka BP).

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