 ISSN 1392-110X ISSN 2029-056X (online) |
2009 m. Nr. 3-4 Petrographic composition and directional properties of tills on the NW surroundings of the Gdańsk Bay, Northern Poland
In this paper, the authors focus on some selected lithological properties of tills: petrographic composition of the 5–10 mm fraction, petrographic composition of the coarse fraction (>20 mm, analysed by the indicator erratics method) and the long axis orientation of clasts. As the study area the authors chose a territory located in Northern Poland on the NW surroundings of the Gdańsk Bay – between Puck and Lake Żarnowieckie. It was found that during the Last Glaciation the study region was fed mainly from the territory of Sweden, middle and south-eastern Sweden in particular. There existed, in parallel with the dominant (in the study region) NNW ice-sheet advance direction, also another, local ice-sheet advance route manifested in the east, which deposited a till bed in the neighbourhood of Puck. Keywords: till, petrographic analysis, till fabric, weathering, Vistulian, Pomerania, Poland |
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