As so ci ate Ed i tor: Micha³ Zatoñ Lithological and palynological stud ies of Paleogene siliciclastic de pos its from the Yantarny P-1 bore hole lo cated on the western coast of the Sambian Pen in sula (Kaliningrad re gion, Rus sia) show that the suc ces sion is char ac ter ized by nu mer ous sed i men tary dis con ti nu ities re lated to lithification ho ri zons and ero sional sur faces. Sed i men tary gaps are emphasised by hardgrounds. Palynological data sug gest the Selandian-Priabonian age of the suc ces sion and in di cate a num ber of sig nif icant strati graphic gaps. An im por tant change in heavy min eral com po si tion is rec og nized be tween the Paleocene and Eocene de pos its in the area stud ied. A sig nif i cant num ber of re worked Cre ta ceous microfossils is ob served in the Selandian part of the suc ces sion stud ied.

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The focus of this study was the 11.55 m long sediment core 303700-7, which was retrieved from the Gdansk Basin during a cruise of RV 'Poseidon' within the frame of the Russian-German Project GISEB. The core was analysed for grain size, elemental chemical composition, organic carbon and palynological spectra. The age control was based on palynostratigraphy and 7 radiocarbon datings of bulk sedimentary organic matter. These data provide a high-resolution record of climatic and marine palaeoenvironments in the Gdansk Basin for the last ca. 13 kyr, from the Bølling to late Holocene time. Sedimentation rates were estimated to vary between 0.37 and 1.62 mm yr -1 . Major variations in palaeosalinity were estimated from bromine concentrations in the sediment. This method allows the first quantitative reconstruction of palaeosalinity changes in the Baltic Sea, especially profound during the Littorina and Postlittorina periods (middle to late Holocene). In addition, grain size data indicated several Littorina transgressive-regressive stages and a few episodes of increased near-bottom current activity. Our results from the Gdansk Basin are consistent with palaeoceanographic data from other deep basins of the Baltic Sea and provide new insights into the regional Holocene history.

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