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Vadim Sivkov, Atlantic branch of Shirshov Institute of Oceanology, Russian Academy of Sciences (Russian Federation)
Dmitry Dorokhov, Atlantic branch of Shirshov Institute of Oceanology, Russian Academy of Sciences (Russian Federation)
Marina Ulyanova, Atlantic branch of Shirshov Institute of Oceanology, Russian Academy of Sciences (Russian Federation)
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Existing knowledge on submerged coastlines near Kaliningrad Region (Blazhchishin et al., 1982; Kharin, 1986; Gelumbauskaite et al., 1991; Blazhchishin et al., 1998; Emelyanov & Romanova, 2002) are incomplete and conflicting. The reasons of it are primitive echosounders and rough positioning of profiling data.
New data on bottom relief of the Gdansk Basin collected in few cruises of r/v Professor Shtokman (2004-2007) by modern echosounder and GPS positioning were used for clearing this matter. The conclusions of Uscinowicz study (2003) were used for interpretation of our data and getting specified scheme of submerged coastlines. The generation of some terraces has no explanation. So in past the terrace at depths 73-77 m is obviously mistakenly associated with Baltic Ice Lake. We associate this terrace with structure of bedrocks and hypothetically with activity of bottom currents acted at halocline level during Litorina Stage.
Two symmetrical sequences of small terraces defined at Sambian Peninsula underwater slope and Curonian-Sambian underwater plateau have an especial interest. The whole profile looks like submerged river valley. Genesis of these small terraces requires additional investigations. Probably they argue about stepped nature of the first Litorina transgression.
Northward of Sambian Peninsula at depth about 30 m was discovered submerged channel (?) which apparently was formed by alongshore currents transported material of coastal abrasion and bottom erosion. This channel can play an important role in sedimentary matter balance of sedimentary system Sambian Peninsula - Curonian Spit - Curonian-Sambian Plateau.
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