pseudokarst, crevice-type caves, Outer Western Carpathians, deep-seated landslides, microstructural measuring, electrical resistivity tomography

The Kněhyně cave (Moravskoslezské Beskydy Mts., Outer Western Carpathians, Silesian Nappe) is one of the most pronounced crevice-type cave system in the Czech Republic. The crevice-type (rock-slide) cave has developed in the context of propagation of deep-seated gravitational slope deformation (DSGSDs). By using speleological technics we can follow the inner structure of landslide right in underground. Through the microstructural measuring of main discontinuity sets (joints, faults and bedding planes) and their correlations in various parts of the cave, main types of mass movements leading to the formation of crevices in the different passages and horizons can be discovered. On the contrary to previouos research supposing toppling model for the evolution of cave, our investigation reveales that crevice-type has originated due to the complex pattern of slope processes.