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SUMMARY

Karst depressions are filled (or lined), at least in the first stages of their development, with material subsiding from permeable deposits that cover the carbonate rocks. Without such a cover no depressions can be formed. In the case of very impure limestones, the fill of the depressions consists for a great part of the insoluble residue from these limestones.

Simultaneously with the morphological evolution of the depressions, their fillings also undergo important changes. The evolution terminates with a denuded karst. The solution processes may be re-activated if the surface is covered by new (allochthonous) sedimentary material.