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Different hypotheses about collapse dolines development have been suggested. The most current one advances as a cause sudden roof collapse above karst caves. The investigations on classical Karst of NW Yugoslavia (Skocjanske Jame, Postojna Cave System, etc.) show that the collapse dolines were formed as a result of the development of water channels under them. The vast collapse forms gradually developed from former dolines, in several phases. They got their significant shapes mostly during huge climatic changes in Upper Würm and Holocene.
Gospodarič, Rado, "Age and development of collapse dolines above the cave systems. The examples from classical karst of Slovenia (NW Yugoslavia)" (1985). KIP Articles. 117.