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Closed depressions (CDs) are common forms occurring in the European loess belt. So far, investigations of CDs in Europe have suggested various natural or/and anthropogenic processes leading to their formation. The origins of CDs occurring in the loess areas of Poland have been the subject of few investigations, and their results have not clarified the problem. Most frequently, the age of CDs is linked...
Closed depressions (CDs) are landforms typical for loess areas. 1761 CDs have been inventoried within the Nałęczów Plateau. Large concentrations of CDs: 30–40 forms per km2 occur in areas where thick (more than 10 m) complex of glacigenic sediments (mainly glacial tills) or clay (limniglacial) deposits underlying loess cover. Areas with a low concentration of CDs (fewer than 10 forms per km2) correspond...
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