Commune: Ochotnica Dolna (pow. nowotarski, woj. małopolskie)
Framework element or context represented:
Stratigraphy of the Magura unit.
Primary geological/geomorphological interest:
Stratotype of the Magura Formation – flysch of the Outer Carpathians, Magura unit, Krynica subunit.
Comparative assessment justification:
The type sequence of flysch sediments of the Magura Fm – widespread and the most typical lithological unit of the upper part of the Magura nappe of Polish Outer Carpathians. Reference profiles of the Magura Fm are situated in the vicinity (Zabrzeż, Maszkowice).
Protection status and accessibility:
Proposed nature monument; well accessible and illustrative, described in some geological guide-books.
Character of site: Natural, partly artificial outcrops.
Area: 1 ha
Altitude: 385-420 m a.s.l.
Lithology: sandstones, shales, silstones, claystones
Discipline: Palaeoenvironment, Stratigraphy of Phanerozoic
Process Age: *all periods
Bedrock Age: Paleogene, *all periods
Description of primary interest:
The sequence of flysch rocks (inclined to the north) is exposed in steep slope of subordinary hill, called Baszta, mounting above Dunajec river in the Beskidy Mts part of Dunajec gap. The set of natural and artificial outcrops is 130 m long and 35 m high. The rock profile (some 50 m long) and sedimentary structures (also biogenic), tectonic phenomena and stratigraphic position of the rocks have been thoroughly studied here. The rocks sequence was accepted as a stratotype of the Magura Fm. The Magura Fm is represented mainly by thick-bedded sandstones widespread and forming mountain ridges of the Beskid Sądecki and Gorce Mountain Groups. In the sequence exposed in the Baszta hill several sections has been distinguished (upward): 1) thin-bedded sandstones and shaly siltstones (more than 7 m); 2) thick-bedded, coarse grained sandstones, locally conglomeratic, with deformational (slump) structures (14 m); 3) bedded, finer grained sandstones intercalated with shales (6 m); 4) bedded sandstones grading upward to thick-bedded, coarse grained ones (4 m); 5) thick-bedded, coarse grained and conglomeratic sandstones (more than 15 m). The rocks represent sediments of turbidite flows deposited in the submarine channels (sections 2, 3 and 5) and on the submarine fan surface (section 4) at a bottom of the Magura basin situated in northern, peripheral part of the Neotethys ocean. In the lower part of the section no 2 structure of submarine slide formed on slope of turbidite flow channel was identified.
Literature:
ALEXANDROWICZ Z. (ed.), MARGIELEWSKI W., URBAN J., GONERA M. 1996–Geoconservation of the Beskid Sądecki Mountains and the Sącz basin, Polish Carpathians (English sum.). Studia Naturae 42, 148 pp. ALEXANDROWICZ Z., POPRAWA D., RĄCZKOWSKI W. 1999–Stratotypes and other important geosites of the Polish Carpathians. Pol. Geol. Inst., Spec. Papers, 2: 33-46. BIRKENMAJER K., OSZCZYPKO N. 1989–Cretaceous and Paleogene lithostratigraphic units of the Magura Nappe, Krynica subunit, Carpathians. Ann. Pol. Soc. Geol. 59, 1-2: 145-181. GOLONKA J., OSZCZYPKO N., ŚLĄCZKA A. 2000–Late Carboniferous-Neogene geodynamic evolution and paleogeography of the circum–Carpathian region and adjacent areas. Ann. Soc. Geol. Pol 70, 2: 107-136. KSIĄŻKIEWICZ 1958–Submarine slumping in the Carpathian flysch (English sum.) Rocz. Pol. Tow. Geolog. 28, 2: 123-150. OSZCZYPKO N. 1992–The Late Cretaceous through Paleogene evolution of Magura. Geol. Carpathica 43, 6: 333-338. OSZCZYPKO N., DUDZIAK J., MALATA E. 1990–Stratigraphy of the Cretaceous through Paleogene deposits of the Magura nappe in the Beskid Sądecki range, Polish Outer Carpathians. Studia Geol. Pol. 97: 109-181. OSZCZYPKO N., POREBSKI S. 1985–Stop 70: Tylmanowa. In: Birkenmajer K. ed., Main geotraverse of the Polish Carpathians, Guide to excursion 2, Carpatho-Balkan Geol. Assoc. XIII Congr., Geol. Inst., Warsaw: 180-184. OSZCZYPKO N., WOJEWODA J., ALEKSANDROWSKI P., UCHMAN A., TOKARSKI A 1992–Wycieczka A.1.6. Tylmanowa (Polish only). In: Zuchiewicz W., Oszczypko (eds), Przewodnik 63 Zjazdu Pol. Tow. Geol. Pol. Tow. Geol., Kraków: 56-64.