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Sedimentary formations of Karpathian represent the oldest widespread unit of the autochtonous Tertiary in the Czech part of the Upper Silesian Basin. Occurrence and distribution of thickness of the Karpatian point to complicated geological development. It was probably formed in tectonically predisposed sedimentary depressions with large infl uence of the Old Styrian nappes, which were thrusted over the area of original sedimentary cover in the northeastern part of the Carpathian Foredeep. Main topic of our work is evaluation of possible mistakes in interpretation of the autochtonous Karpatian thickness. Original contour line maps of the autochtonous Karpatian distribution and thickness in the area of interest are based on exploratory borehole profi les.