Abstract
Abstract the aim of this article is the description of lithofacies characteristics of sediments forming the north-east part of the morainic upland edge zone in the vicinity of Piaski Pomorskie (west Pomerania). the paper undertake also an attempt to reconstruct paleogeographical conditions of the formation of moranic uppland edge. The diversification of glaciofluvial and fluvial processes during the phase of stagnation and recession of uppervistulian ice-sheet in the vicinity of Piaski Pomorskie (western Pomerania) led to the formation of a morainic upland edge distinctly marked in morphology The edge zone separates the undulating moraine plateau from a lower situated Dębnica River Valley. This area is mostly formed by fine-grained sands with occasional layers of a coarser fraction of gravel and coarse- and medium-grained sands. The observed type of low-angle cross-stratification and trough cross-stratification indicates the dominance of diversified energy depositional environment with considerable power of water as transporting medium. the research area was formed at the front of the ice-sheet, which receded from the nearby reach of the Pomeranian Phase of the weichselian glaciation.
Highlights
Variability and dynamics of depositional processes related to glacier and meltwater activity is visible in both the morphology of studied areas and in lithofacies record of sediments forming individual parts of the region
ABSTRACT: the aim of this article is the description of lithofacies characteristics of sediments forming the north-east part of the morainic upland edge zone in the vicinity of Piaski Pomorskie. the paper undertake an attempt to reconstruct paleogeographical conditions of the formation of moranic uppland edge
The observed type of low-angle cross-stratification and trough cross-stratification indicates the dominance of diversified energy depositional environment with considerable power of water as transporting medium. the research area was formed at the front of the ice-sheet, which receded from the nearby reach of the Pomeranian Phase of the weichselian glaciation
Summary
Variability and dynamics of depositional processes related to glacier and meltwater activity is visible in both the morphology of studied areas and in lithofacies record of sediments forming individual parts of the region. Fundamental aim of research was the to reconstruct paleogeographical conditions of glaciofluvial and fluvial processes intensity during the recession of uppervistulian ice-sheet in the Parsęta lobe, in the area of morainic upland edge of Piaski Pomorskie surroundings. The Piaski Pomorskie morainic upland edge zone separates the undulating morainic plateau from a lower situated Dębnica River Valley. It is limited by the lowering of the Dębnica furrow, which cut the undulating moraine plateau, filled with sand and gravel sediments of glaciofluvial and fluvial origin. The large crevace-filling form (Łęknica) is situated in the south-eastern part of the research area, on the borderline between the lowering of the glacial furrow and morainic upland edge (Paluszkiewicz 2008, 2011). The geological structure layout of the area is dominated by glacial gravel and silty sands, glacial tills and glaciofluvial sands (Popielski 2000, Fig. 3)
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