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. We propose a new concept of the Weichselian ice dynamics in the south-westernsector of the Baltic Sea depression. The review of existing geochronologicaldata from Germany, Denmark and southernmost Sweden in combination with newopticallystimulated luminescence (OSL) data from the German Oder Lobe area is the basis for a reassessment andan improvement of previous ice dynamic models. Factors like the pre-existingtopography, glaciotectonic features and the occurrence of till beds andinter-till deposits of varying origin are also taken into consideration forour process-based reconstruction of the sedimentary environments close tothe ice margin and hence the ice dynamics of the Scandinavian Ice Sheet(SIS). During the early MIS 3 (marine isotope stage), the late MIS 3 and MIS 2, the SISadvanced into present-day terrestrial areas around the south-western BalticSea Basin. The first ice advance during the warming phase in early MIS 3 is poorlydocumented as the Ellund–Warnow Advance in Germany but may be correlated withthe numerically dated Ristinge Advance in Denmark and Sweden. The late MIS 3 advance in contrast is reliably documented. It shaped thelandforms of the Brandenburg Advance and the maximum Weichselian ice extent inthe Oder Lobe area in north-eastern Germany and occurred contemporaneously with theKlintholm Advance in southern Sweden and Denmark. The lack of acorresponding till in various cliff profiles along the Baltic Sea coastlinebetween southern Schleswig-Holstein and the island of Rugen can beexplained by the distinct lobate structure of this ice advance, which wasstrongly guided by the pre-existing low-lying topography. We propose thehorst of Bornholm, Denmark, acting as an ice divide, with ice-dammed lakes existing onthe lee side between two glacier lobes. This lobate structure had not beenconsidered in previous conceptual models, which led to seeminglyconflicting chronological and stratigraphical interpretations. Ourintroduction of the lobate structure for the first time resolves thesecontradictions and integrates the data in a coherent model. The dynamics of the MIS 2 readvance to the Last Glacial Maximum (LGM)extent were clearly different to the previous advance and were most likelycharacterized by a more uniformly advancing ice front with a less lobatestructure which also overrode the horst of Bornholm and the island ofRugen. This advance reached the maximum Weichselian ice extent in someparts of the south-western SIS, but, in the Oder Lobe area, it is proven tohave terminated at a lesser extent than the early MIS 3 advance, but it didshape the most prominent morphological landform record of the last glacialcycle. In order to advance the reconstruction of Weichselian ice dynamics in thefuture, we strongly suggest using both an MIS-based terminology and aprocess-based approach in the interpretation of geochronological data tolive up to the dynamic nature of continental ice sheets.

eiszeitalter und gegenwart

Proposing a new conceptual model for the reconstruction of ice dynamics in the SW sector of the Scandinavian Ice Sheet (SIS) based on the reinterpretation of published data and new evidence from optically stimulated luminescence (OSL) dating