Paleogeografia wybranych obszarów Polski w czasie ostatniego zlodowacenia
Paleogeography of Selected Areas of Poland During the Last Glaciation

Summary/Abstract: The study is focused on the palaeogeographic analysis of parts of the Suwałki Lakeland, Dobrzyń Lakeland, Drohiczyn Plateau and selected valleys of the High Tatra Mts. during the last glaciation. Geomorphological and geological analysis, geoelectric sounding and dating of deposits, mainly using cosmogenic 36Cl, have been applied in the research. The lobe advance of the last glaciation in the Suwałki Lakeland area resulted in the presence of small areas uncovered by ice. The age of the Bachanowo erratic boulder field (26.9–14.4 ka) shows variable rate of erosion. In the Dobrzyń Lakeland the line of moraines considered to represent the extent of the Dobrzyń Phase was formed in fact due to superposition of moraines of the oscillating ice-sheet retreat. Thus, the extent of the phase was more to the north, marked by the moraines occurring between Kikół, through Chrostkowo and Nadróż, to Rypin. There is strict relationship between the Pleistocene geological processes and the basement structure. The site in Wildno with sub-till deposits with malacofauna is described. The dense occurrence of ice-wedge casts in the Drohiczyn Plateau evidences that during the last glaciation the area was subject to severe and dry climatic conditions resulting in the development of permafrost. Correlation of the wedge axes with the orientation of lineaments indicates that the relief of this part of the plateau developed before the last glaciation. The oldest glacial deposits in the Tatra Mts. are of Early Vistulian age and are preserved on Goły Wierch. The eratic boulder field on Hurkotne was formed in several stages; the youngest took place in the older part of the Białka Stadial. Most probably the glaciers of the Tatra Mts. had the widest extent in the older part of the last glaciation. The evolution of the last glaciation in Poland depended not only on global climatic changes, but to a significant degree also on regional and local climatic, morphological and geological conditions.

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