Commune: Żegocina (pow. bocheński, woj. małopolskie)
Framework element or context represented:
Stratigraphy of the Cretaceous deposits in the area of a tectonic window - Grodziszcze Beds of Silesian Unit.
Primary geological/geomorphological interest:
Sequence of Cretaceous deposits, stratotype of Żegocina Marls.
Comparative assessment justification:
Lithotype of Grodziszcze Sandstone and stratotype of Żegocina Marls.
Protection status and accessibility:
Quarry is proposed for protection for a long time
Character of site: Abandoned quarry and natural outcrops.
Area: 0.03 ha
Altitude: 360 m a.s.l.
Lithology: sandstones, other siliceous rocks, coals, limestones, marls, shales
Discipline: Palaeobiology, Palaeoenvironment, Stratigraphy of Phanerozoic
Process Age: *all periods
Bedrock Age: Cretaceous, *all periods
Description of primary interest:
The vicinity of Żegocina town distinguishes by the tectonic window with beds strongly folded of different Carpathian series. In the quarry there is visible Grodziszcze Sandstones (Hauterivian - Aptian) belonging to the Silesian Unit. The profile visible in the quarry begins with a turbiditic sandstones and shales with Carboniferous coal. The sequence passes upwards to a medium and thin-beddedsandstones, which are intercalated by grey shales containing, agglutinated foraminifera. Also ammonites, belemnites and aptychies have been found. The thickness of sandstones layers are 8 – 25 cm, rarely 3 –5 cm and 30 – 40 cm. Sedimentological and palaentological investigation were recognized several lithofacies with different types of foraminiferas. This indicates various processes of submarine gravitational transport (debris flow, turbidity currents and sedimentation from suspension), which was caused of cordillera activity. There are several lenses in the profile, which are probably represent dune or sand wave. In the central part of the left quarry wall there is a unique coarse grained clastic dyke. Near the quarry, in the stream, there are visible Maastrichtian grey marls and marly limestones (the Żegocina Marls) of Turonian and Senonian age. The limestones are micritic, very lithified, and contain brown chert nodules.
Literature:
KAMIŃSKI M., PESZAT C., RUTKOWSKI J. 1963–The Lithology of Grodischt Sandstone in the Flysch carpathians (English sum.). Rocznik PTG 33, 1:11-48. MALIK K., OLSZEWSKA B. 1984–Sedimentological and micropaleontological study of the Grodziszcze Beds at Żegocina (Flysch Carpathians) (English sum). Rocznik PTG 54, 3-4: 293-334. SKOCZYLAS-CISZEWSKA K. 1960–Geology of the Żegocina Zone (Western Flysch Carpathians) (English sum.). Acta Geol. Pol. 10: 485-491. ŚLĄCZKA A., KAMINSKI M.A. 1998–Excursion 2, Stop 12. In: A guidebook to excursions in the Polish Flysch Carpathians. Grzybowski Foundation. Special Publication No. 6. Kraków. UNRUG R. 1969–Wycieczka nr 17. In: Przewodnik geologiczny po zachodnich Karpatach fliszowych. (Polish only). Wyd. Geol. Warszaw.