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The paper considers previously unknown denudation-tectonic circular landforms with the diameter of 1.5-2 km, defined by us as karst calderas. These forms are presented in western Georgia, namely in Zemo Imereti Plateau, on the carbonate-terrigenous cover of the Georgian block. Endogenous-exogenous mechanism and conditions of their origin have been proposed in the paper. The integrity of the substrate cover in its local volume is violated by the stamp impact of the hearth structure on the covering of Pre-Cretaceous...