This publication presents the recent data achieved in frame of scientific projects that were granted to several members of the authors ́ team. These projects have been focused on various aspects of geological research in the area concerned, especially to the structure, tectonic evolution, lithology and biostratigraphy of sedimentary formations, and petrology of basement complexes. Our aim is to make the readers acquaint with the new results and actual views on the structure of a piece of the Western Carpathians that connects the internal orogenic zones characterized by the Palaeoalpine nappe structure and the external zones representing the Cenozoic accretionary wedge. In between, the Pieniny Klippen Belt occupies the backstop positionand is characterized by a unique composition and complex structure. Nevertheless, many problems remain unsolved, particularly the age and tectonic affiliation of some formations within the Klippen Belt. Hence this work represents the state of the art with a lot of open questions to be resolved by the future research.