Fig. 2. Interpretation of one of our high-resolution seismic profiles across the outer continental shelf in the Black Sea south of the Ukraine illustrating an erosional unconformity (bold line) which has truncated an underlying glacial-age alluvial and delta deposit. This scar is ubiquitous everywhere above the -150 m isobath. Sediment cores obtained in 1993 are indicated by vertical lines which mark the extent of sub-bottom penetration into and through the unconformity. Circled numbers are for cores which had to be projected onto the profile. The asterisks point to locations where mollusks were extracted from the base of the uniform drape resting on the unconformity. The identical radiocarbon ages (7,150±100 yrbp) of the shells document a flooding surface which reached inland from the shelf edge to at least the -49 m isobath. The rapid transgression left the erosion surface intact as shown by the uniform burial of a former river channel.