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Ice-wedge casts and involutions as permafrost indicators and their stratigraphic position in the Weichselian



Ice-wedge casts and involutions as permafrost indicators and their stratigraphic position in the Weichselian



International Conference on Permafrost, Proceedings 4: 1298-1302



Ice-wedge casts and large size involutions are typical periglacial features in the Weichselian deposits of northwestern Europe. The ice-wedge casts consist of a central part with vertical lamination and a faulted marginal part. The casts are often arranged in a subparallel pattern, which respresents an initial stage in the development of a true polygonal network. They are always closely associated with overlying intense involutions with amplitude of ca. 1.5 m. These involutions are often flat-bottomed and developed in a symmetrical way. They are explained as "periglacial load structures". Degradation of the ice-rich permafrost top caused a state of over-saturation in poorly drained areas. In the Weichselian sediment series two levels of ice-wedge casts connected with intense involutions are recorded. They point to permafrost conditions at the start of the middle Weichselian and at about 20-25,000 years B.P.--Modified journal abstract.

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