Flysch Belt represents a characteristic arc along the outer periphery of the Western Carpathians. It consists of sedimentary rocks deposited during the Mesozoic to Tertiary period in the deep-sea sedimentary basins, such as the Magura basin. The source areas, which supplied the sedimentary material, as thick as several kilometres, are still intensively discussed. Eocene (Tertiary) Makovica sandstones of the Magura Nappe were studied by researchers of the Institute of Geography, in collaboration with the Earth Science Institute of the Slovak Academy of Sciences, the Geological Institute of Dionýz Štúr and the Polish Geological Institute. They published the findings in the established journal of Palaeogeography, Palaeoclimatology, Palaeoecology. The unique aspect of the research is in the first U-Pb radiometric dating obtained from the detrital zircons indicates the Proterozoic to Variscan age (~ 2200–260 million years) of their parent rocks. Heavy-mineral analysis coupled with the palaeocurrent measurements (textural features on the surface of sedimentary rock layers occurred during the sedimentation) and the acquired age data locate the source regions outside the Carpathian domain, presumably in the Tisia microcontinent and Marmarosh massif, which are currently situated in the territory of Southern Hungary, Romania and Transcarpathian Ukraine.