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The Kattegat region is located in the wrench zone between the Fennoscandian shield and the Danish Basin that has repeatedly been tectonically active. The latest ice advances during the Quaternary in the southern part of Kattegat were from the north-east, east and south-east (Larsen et al. 2009). The last deglaciation took place at c. 18 to 17 ka BP (Lagerlund & Houmark-Nielsen 1993; Houmark-Nielsen et al. 2012) and was followed by inundation of the sea that formed a palaeo-Kattegat (Conradsen 1995) with a sea level that was relatively high because of glacio-isostatic depression. Around 17 ka BP, the ice margin retreated to the Oresund region and meltwater from the retreating ice drained into Kattegat. Over the next millennia, the region was characterised by regression because the isostatic rebound of the crust surpassed the ongoing eustatic sea-level rise, and a regional lowstand followed at the late glacial to Holocene transition (Morner 1969; Thiede 1987; Lagerlund & Houmark-Nielsen 1993; Jensen et al. 2002a, b). Major parts of Kattegat are characterised by thick successions of Late Weichselian and Holocene sediments (Morner 1969; Bergsten & Nordberg 1992; Gyldenholm et al. 1993). At around 9.6 ka BP, a large lagoon–estuary environment in southern Kattegat was partly blocked by transgressive, coastal barrier islands and spits (Bennike et al. 2000; Jensen et al. 2002a). The aim of this paper is to describe the late glacial and early Holocene development of southern Kattegat, based on a recent study (Bendixen 2012). The study area covers 1696.5 km2 and is located south of the island of Anholt in the southern part of Kattegat (Figs 1, 2). The south-western part of the area is shallow but water depths increase to the north-east where depths over 40 m are found (Fig. 2). Two distinct submarine channels running nearly N–S and NE– SW were probably formed by subglacial meltwater erosion; these channels are partly filled by late glacial and Holocene sediments. The area can be seen as a transitional shallowwater area at the entrance to the Baltic Sea (Bennike et al. 2000). Detailed 2D seismic work will be conducted in the region over the next years, which will improve the basis for interpretations in the coming years.

Late glacial to early Holocene development of southern Kattegat