landslide; earthflow; retrogressive evolution; landslide-dammed palaeolake; Magura nappe; Moravian-Silesian Beskids; Czech Republic

Frontal parts of nappes and overthrusts belong to the most exposed environments in the evolution of slope deformations. The frontal part of the Magura Nappe creates a distinct morphotectonical and lithological boundary characterized by occurrence of various types of slope deformations. A representative example of such failures is on the northern slope of the Hlavatá Ridge (Moravskoslezské Beskydy Mts.). Radiocarbon dating of peat bogs and lacustrine deposits of a fossil landslide-dammed lake enabled us to constrain the chronology of a retrogressive landslide. The main phase of the landslide evolution took place ~1.6 ka BP; secondary distinctly retrogressive reactivation of the landslide occurred in 0.8-0.9 ka BP. Our case study demonstrates dynamic Late Holocene geomorphic evolution in the area of the Flysch Carpathians and re-evaluates the chronology of landforms previously considered as of the Pleistocene age.

Frontal parts of nappes and overthrusts belong to the most exposed environments in the evolution of slope deformations. The frontal part of the Magura Nappe creates a distinct morphotectonical and lithological boundary characterized by occurrence of various types of slope deformations. A representative example of such failures is on the northern slope of the Hlavatá Ridge (Moravskoslezské Beskydy Mts.). Radiocarbon dating of peat bogs and lacustrine deposits of a fossil landslide-dammed lake enabled us to constrain the chronology of a retrogressive landslide. The main phase of the landslide evolution took place ~1.6 ka BP; secondary distinctly retrogressive reactivation of the landslide occurred in 0.8-0.9 ka BP. Our case study demonstrates dynamic Late Holocene geomorphic evolution in the area of the Flysch Carpathians and re-evaluates the chronology of landforms previously considered as of the Pleistocene age.