Pagórki Warciańskie – przykład złożonej formy glacigenicznej
Warta Hills – an example of a complex glaciogenic form

Summary/Abstract: From many postglacial forms in morphological landscape of the Łódź region there are forms with atypical characteristics in terms of clear basic categories. One of them are the Warta Hills. Despite this form has been examined by many reseachers (Klatkowa 1972; Krygowski 1972; Klatkowa, Załoba 1991; Turkowska 2006) the problem of its generic type classification is not solved. The aim of the article work was an attempt to reconstruct deformation fields and palaeostress in which grew up this kinds of deformation. The analysis was based on measurements of crack, faults, folds and disturbed layers. There were 270 measurements of faults and cracks performed in those sediment which were then summarized in a stereographic projection of the lower hemisphere on the Schmidt grids. Symmetry planes marked by Paterson and Weiss (1961) were the basis to determination of course of palaeostress axis and its character. Results of this study lead to the conclusion that there are two separate levels of deformation. The lower level of the main strain plane NE-SW has got compression character and is associated with two directions of compression – gravitational vertical and horizontal with direction of the NW–SE. Upper level of deformation is connected with stress fields, which has been created as a result of the impact of the uplift clay diapirs on the course of the NW–SE. In addition, an extensive influence on the upper level of deformation have morphological edge and the steep slopes of test form. Facts lead to the conclusion that the origin of Warta Hills is complex, the formation of this form was formed in at least two stages. The first was the stage of the glacial ice transgression from the NW to SE direction and resulting in the lower deformation level. The second stage took place during areal deglaciation in the system inherited from crevasse in dead ice on the same axis as the surrounding kames (Chabierów and Góra). Those crevasse pattern where the places of deposition of glaciofluvial sediments but also faulting due to static pressure of dead ice.

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