Osady paleogenu płaszczowiny magurskiej w rejonie Owczar (Beskid Niski)

Kazimierz Bogacz, Janusz Dziewański, Antonina Jednorowska, Stanisław Węcławik


Paleogene deposits of the Magura nappe near Owczary (Polish Flysch Carpathians)

The Paleogene deposits in the region of Owczary village (SĘ of Gorlice) belong to the Gorlice facial zone of the Magura nappe. The described deposits are exposed in the core of an anticline streachimg NWW — SEE (Fig. 1). In ascendent order they have been divided into four lithostratigraphical units, as follows: the Ropianka Beds (former Inoceramian Beds), variegated Beds, Beloveza Beds and the Magura Beds. The age of the units has been defined on the basis of microfauna. The Inoceramian Beds and the lower part of the Variegated Beds are of Paleocene age. The Early Eocene age of the upper part of the Variegated Beds can be estimated only indirectly. They overlie microfaunically documented Paleocene sediments and contain a foraminiferal assemblage which appears in the Magura nappe between the Paleocene and Eocene sediments, moreover they contain Hormosina ovulum (Grzybowski); this species in the Polish Flysch Carpathians does not pass the Early Eocene /Middle Eocene boundary (Gsroch 1966). It is worth stressing that for the first time in the Variegated Beds of the Magura nappe there has been recorded the occurrence of siliceous gaizes (Fig. 1, Pl. I). Indirect date allow the assumption that the Magura Beds are of Late Eocene — Oligocene age. The profile of the Owczary has been correlated with the other profiles of the Magura nappe towards south as far as the zone neighbouring with the Pieniny Klippen Belt (Fig. 3). The Turonian-Senonian red shales and marls appear as the oldest in the profile. They are known from the region of Grybów (Sikora 1957) and from the southern facial zone of the Magura nappe at Złockie and Szczawa (Chrząstowski 1969, 1971) also between Szczawnica and Czorsztyn (Birkenmajer, Geroch 1961, Bogacz, Węcławik 1962). They underlie the Ropianka Beds of the Late Cretaceous — Paleogene age. Within the latter are such homotaxial units as: „nördliche Grenzbildungen (Uhlig 1890), „fore-klippen flysch” (Kuźniar 1910), „Flysch der nördlichen Grenzzone” (Małkowski 1923), „Flysch der nördlichen Grenzzone sensu stricto” (Birkenmajer 1954), Szczawnica and Kluszkowce Beds (Birkenmajer 1958), Beloveza Beds (Bogacz, Węcławik 1962), Inoceramian Beds (Żytko 1963) and also Paleogene Beds of Ropianka lithotype in the region of Piwniczna (Ostrowieka 1965), Złockie (Chrząstowski 1969), and Krynica (Świdziński 1972). As intercalation among the Ropianka Beds are to be treated the interfingering with them the Jarmuta Beds (Birkenmajer 1958), sandstones with lithothamnia (Alexandrowicz at al. 1966) and Szczawnica Sandstones (Sikora, Żytko 1959), Mutne Sandstones (Sikora 1970) and Świątkowa Beds (Jurkiewicz, Karnkowski 1959) which has been treated earlier as facial modification of Inoceramian Beds (Węcławik 1969). In the northern region of the Magura nappe over the Ropianka Beds there lie the Beloveza Beds and in the southern one the Piwniczna Sandstones. In the transitional zone1 both in the Beloveza Beds and in the Piwniczna Sandstones there are intercalation of Łącko Marls (Fig. 3). These deposits are separated as Łącko Beds (Węcławik 1969b). To the south the Piwniczna Sandstones and partly the Łącko Beds are covered by Middle Eocene red shales, and this in turn by “Hierogliphic Beds”.

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