Zur periglazi ren Bildung und überformung rinnenartiger Strukturen im Jungmor nengebiet Süd-Holsteins

The Bargfeld-Stegen sandur area (Schleswig-Holstein) north of Hamburg is characterized by an intense periglacial shaping. Channel-like features, hereinafter referred to as channels, up to 26 meters wide and 3.5 meters deep, as periglacial forms are incisive. Similar features can be observed in Itzehoe, Tangstedt (Norderstedt) and Schalkholz. Common features of these channels are: a usually shallow-convex cross section, an infill including re-deposited till, undercutting and other fluvial characteristics at the flanks, flat base eroded down to a boundary surface (permafrost), a diapir-like uplift of channel fillings in the upper channel parts and at the channel flanks, the parallel channel courses, sand-filled secondary channels and a linear progression of channels, preferably diagonally to the ice movement. The structures seem to appear mainly in slope positions in the marginal zones of the regional till-cover. Different forms of their generation have to be considered. They were probably mainly formed during the periglacial climate (Weichselian) by periglacial-fluvial processes (abluation) combined with solifluction.