Abstract
Various exposures and core drillings in drumlins of the southwestern part of the Bodanrück drumlin field were examined. Sequences start with fine-grained till and lake deposits, followed by marginal gravels and end upwards with an upper till which is often deformed and sheared. The whole sequence is of Würm age, gravels and upper till are deposits of the last major re-advance of the piedmont glacier (Innere Jungendmoräne, IJE), which is also the time of drumlin formation. Clastic dykes within the gravels also date from this time. They are younger than gravels but older than the upper till. Thickness of permafrost during dyke intrusion is estimated to be 50 m. Drumlins consisting of gravel and till are described. An early erosional phase of drumlin formation is contemporaneous to the erosion of the Mindelsee glacial basin. Also upper parts of one of the clastic dykes were deformed, indicating that the permafrost surface may have started to sink down during deformation. Facies transitions of till drumlins may reflect ongoing erosion of the Mindelsee basin or local paleotopography of the gravel surface.
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