Abstract
The Geological Survey of Denmark and Greenland (GEUS) and the Institute of Baltic Sea Research in Warnemünde (formerly the Institut für Meereskunde of the DDR) have co-operated for more than two decades on unravelling the history of the south-western part of the Baltic Sea, mainly based on shallow seismic profiling, sampling of sediment cores and analyses of core samples (Jensen et al. 2002). Here we report on some results from one of the latest joint cruises with the German research vessel Maria S. Merian.
Highlights
IntroductionDuring regional mapping in the early 1990s, the Geological Survey of Sweden discovered pre-Holocene marine sediments to the north-east of Kriegers Flak in the western part of the Arkona Basin (Fig. 1A)
The Geological Survey of Denmark and Greenland (GEUS) and the Institute of Baltic Sea Research in Warnemünde have co-operated for more than two decades on unravelling the history of the south-western part of the Baltic Sea, mainly based on shallow seismic profiling, sampling of sediment cores and analyses of core samples (Jensen et al 2002)
During the Eemian, connections to the Baltic Sea were found via Karelia to the White Sea, and via Denmark and northern Germany to the North Sea (Funder et al 2002)
Summary
During regional mapping in the early 1990s, the Geological Survey of Sweden discovered pre-Holocene marine sediments to the north-east of Kriegers Flak in the western part of the Arkona Basin (Fig. 1A). This find has major palaeogeographical implications because it is the only interstadial marine deposit reported from the area. Five samples from non-marine sediments deposited above the brackish unit at Kriegers Flak, but in connection with it, have been radiocarbon dated – and gave finite ages. A reasonable way to explain the low values from Kriegers Flak is by assuming a mixture of sea water and meltwater from the Scandinavian ice sheet. Five samples from the clay were analysed for pollen, but the interpretation of the pollen spectra was hampered by the presence of reworked pollen grains (Klingberg 1998)
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