Staroplejstoceńska sieć dolin kopalnych Sudetów Zachodnich i ich przedpola

Marek Michniewicz, Marek Czerski, Janusz Kiełczawa, Andrzej Wojtkowiak



The geological research works and the field geophysical investigations allowed the reconstruction of the early Pleistocene buried valleys network in the Western Sudetes and to ascertain an existence of the so-called Sudetic Quaternary Fault System. On its north side, this spatially complicated system of neotectonic dislocations results in that the buried valleys bottoms are thrown down of 30-35 m amplitude. It also forms a sharp boundary - lowered and uplifted parts of the valleys have quite different character of the early Pleistocene deposits. The origin ofthe faults system is connected with advance of the Elsterian. The lithological changes are a result of the glacier stagnation at the back of the fault structure. The Elsterian was the main glaciation period of the Western Sudetes and the later Odranian reached only the periphery of Sudetes. The most of the observed alterations in the route of the Sudetic river system took place after the Elsterian, and only some of them (in the north part of the studied area) occurred after the Odranian. In places where a younger river system covers (or is very similar) to the early Pleistocene river system, the overdeepening of the older forms took place. It particularly refers to the uplifted side of the Sudetic Quaternary Fault System, in a less degree to the shallow valleys in the lowered side. The probable age of the overdeepening was the Lublin (= Pilica) interglacial, however the main process of infilling of the valleys with gravel and sand deposits (with pebbles) took place during the Wartanian.

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