On the relationship between the Paleogene Magura Basin and Pieniny Klippen Belt sedimentary area –the Leluchów sections, a new approaches (Polish Outer Carpathians)

The relationships between the Central Carpathian Paleogene Basin, Pieniny Klippen Belt and the Magura Nappe are still one of the most important questions, which should be answered.
   It is essential for better understanding of the Paleogene paleogeography and evolution of basin located along collision zone of the Central and Outer Carpathian domains.
   Our studies were focused on the contact zone between the Magura Nappe and Pieniny Klippen Belt, close to the Polish-Slovakian border. Between the Udol village in the west and Ruska Vola in the east, the Late Eocene-Oligocene, deposits overlap both the Pieniny Klippen Belt as well as the Magura Nappe. These deposits are known as the Ujak facies. According to traditional opinion the Ujak facies overlapped the Pieniny Klippen Belt, and are overthrust by the Magura Nappe. The best recognized Leluchów section of the Ujak facies are situated on the left bank of the Poprad River, in the contact zone of the Krynica Subunit of the Magura Nappe and the Pieniny Klippen Belt. Unfortunately in this section contact of the Magura succession with lower part of the Ujak succession is covered by thick slope deposits, up to 27 m. Recently, in this area three boreholes have been drilled, by the Polish Geological Institute.
   Combining the field observation with core material, following sequence of deposits of the Magura and Ujak transitional zone can be revealed:
   1) thick-bedded sandstones of the Piwniczna Member (Early/Middle Eocene) of Magura Formation,
   2) thin-bedded flysch and red shales with Reticulophragmium amplectens (Mniszek Shale Member, Middle Eocene) of the Magura Formation,
   3) few meters thick packet of grey-greenish and red marstone of the Sub-Menilite Globigerina Marls (Late Eocene-Early Oligocene),
   4) at least, a 19 m thick dark brown and black Menilite Shales with horstone and tuffite intercalations (Oligocene),
   5) a 25 m packet of thick-bedded muscovitic sandstones, an equivalent of the Poprad Member (oligocene) of Magura Formation,
   6) dark-grey marly shales with intercalations of thin bedded calcareous sandstones of the Malcov Formation (Oligocene).
   The studies conducted by us have shown that during the Late Eocene through the Oligocene the Klippen Pieniny Belt was a transitional zone between the Magura and the Central Carpathian basins.