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3 Przegląd Geologiczny

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Głazy narzutowe z okolic Przedborza jako obiekty geodziedzictwa oraz ich znaczenie w geologii czwartorzędu i geoturystyki

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Górska-Zabielska M. , Wieczorek D. , Zabielski R. , Stoiński A.

Przegląd Geologiczny

2022

tom Vol. 70, nr 1

34--49

The Przedbórz region in the Przedborska Upland (central Poland) is characterized by an above-average presence of erratic boulders. They have never been the subject of separate studies before. The aim of this article is to indicate their large population in central Poland and to characterize the traces of the impact of various morphogenetic processes on their current size and shape. The authors indicate the Scandinavian source areas of some of the studied erratic boulders. The article also highlights the scientific, educational, social and aesthetic function of erratic boulders, which should be used when planning the sustainable development of the region. In peripheral tourist areas, geotourism is an effective tool for economic growth. The erratic boulders discussed in the article, which are unique objects of natural heritage, have great potential to revive this branch of nature tourism.

Analiza petrograficzna narzutniaków w żwirowni Łubienica-Superunki oraz ich skandynawskie obszary alimentacyjne

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Górska-Zabielska M. , Smolska E. , Wachecka-Kotkowska L.

Przegląd Geologiczny

2021

tom Vol. 69, nr 1

43--54

Petrographic studies covered 20-60 mm coarse gravel and 4-10 mm medium-grained fractions of two till horizons (units ŁS II and ŁS IV) and two beds of sand-gravelly-outwash deposits(units ŁS I and ŁS III) associated with the Odra Glaciation (MIS6) in Łubienica-Superunki on the North Mazovian Lowland. Regardless of the facies type and grain sise, crystalline rocks dominate over all other petrographic groups in all samples. The percentage of crystalline rocks is greater among coarse gravel (average 74.7%) than among medium-grain gravel (average 67.8%). The share of carbonate rocks is limited only to the both lower units ŁS I and ŁS II. The upper units (ŁS III and ŁS IV) are deprived of these rocks, both in the medium and coarse gravel fraction. Sandstones, presented in all samples, were in the range of 5-20%. From the other petrographic groups, individual chalk limestones clasts, dolomites, flints and quartz grains were identified in the material. The indicator erratics were identified in all four units. Their percentage content stands for 10-18% of the total sample of coarse-grained fraction. Among them, the most common were the erratics derived from the Åland Islands, and then from the area of south-eastern Sweden (Smaland) and from Dalarna in central Sweden. Amongst the erratics with limited indicator significance, Lower Paleozoic limestones and Jotnian sandstones were most frequent. Single fragments of Ordovician red and Paleoporella limestone were present. These rocks, including the Lower Paleozoic grey limestone, occurred only in thelowerunits(ŁS I and ŁS II). The results of the research suggest that the two lower sediment units should be correlated with a ice-sheet advance (Middle Polish Complex, Odranian Stadial?), and the two upper ones - with a separate, subsequent advancement (Wartanian?). The paper is another methodological contribution to the consideration of abandoning the tedious testing of glacial till and focusing on a much faster petrographic analysis of fluvioglacial sediments associated with the same ice sheet. This is demonstrated by the comparable results of the petrographic analysis of short transport outwash sediments and till from a single glacial period.

Wybrane głazy narzutowe północno-zachodniego obrzeżenia Gór Świętokrzyskich : współczesne znaczenie i potencjał geoturystyczny

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Górska-Zabielska M. , Kusztal P. , Witkowska K.

Przegląd Geologiczny

2019

tom Vol. 67, nr 9

767--774

The article describes 19 erratic boulders of the northwestern margin of the Holy Cross Mountains pointing to their Scandinavian source area. For each boulder, the location, the form of its protection, petrographic type, morphology, and the present and potential significance are also given.