Closed depressions (CDs) are common small forms occurring in the European loess belt. The age, origin and evolution of these forms is highly debated. Some CDs are reproduced in the loess cover. Their formation was directly influenced by the relief of sediments underlying the loess cover and varying in terms of age and origin. Two depressions of this type were documented within the thin (8 m) loess covers in the Nałęczów Plateau and the Dubienka Depression, using the electrical resistivity method. The age of the reproduced forms varies. The CD in Sadurki formed during the Vistulian. The CD in the Horodło site was forming from the Odranian to the Vistulian glaciation.