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The potential importance of confirming or rejecting this hypothesis by refining the chronology of the marine transgression and quantifying the surface water palaeosalinity [6] is the aim of many recent Black Sea palaeoceanographic studies [1,7-19].

The center of the scientific controversy largely involves validation of the in-situ positions and the carbon reservoir age corrections used to date molluscs and to determine an extremely rapid (catastrophic) or “prompt” Holocene flooding of the Ukrainian Shelf [3,4] and the paleo-Danube Delta [16].

These plant materials provide critical new ages for quantifying Black Sea carbon reservoir issues.

Received October 6, 2013; revised October 31, 2013; accepted November 16, 2013 Keywords: Radiocarbon Age; Carbon Reservoir; Delta Peat; Brackish Molluscs; Palynology ABSTRACTDating of major sea-level changes using shells or calcareous microfossils is prone to errors in semi-enclosed marine environments where inputs of seawater and river water vary over time and space.

The need to refine mollusc-based age estimates for the rate of the Holocene marine transgression in the Black Sea is the focus of multiple palaeoceanographic and archaeological studies.

Correct reconstruction of the timing of the marine reconnection and transgression depends on the validity of the estimated differences between Black Sea water reservoir values and the contemporary atmospheric radiocarbon content.

Evaluations of Black Sea mollusc carbon reservoir ages rely mainly on calibration against wood or peat samples presumed to be in situ on a shoreline [7,11,13-15], although there are other attempted calibration methods: tuning by cross-correlation of geochemical records [12]; thermoluminescence [16] and amino acid racemisation (AAR) dating [1,7].