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Bieszczadzki PN arrow Geological structure

Geological structure
09.05.2011.
The Bieszczady National Park is situated in the Outer Carpathians which are flysch formations of two structural units — The Dukla Nappe and Silesian Nappe (Slaczka 1970, Tokarski 1975). These units are made of juxtaposed layers of fractionally differentiated sedimentary rocks.
The Dukla Nappe is built from folds of Wielka Rawka, Paprotna, Borsuk and the syncline of Moczarne. It includes:

- Lupków layers (late Cretaceous) consisting of a shale-sandstone complex with a predomination of silt shales;

- Cisna layers (late Cretaceous – Palaeocene) consisting mainly of thick-layered sandstone;

- Majdan layers (Palaeocene) built of dark grey and black shales with the addition of grey-green shales and sideritic and fuckoidal marls;

- Hieroglyphic layers (Eocene) similar to the hieroglyphic layers of Silesian Nappe.

The Silesian Nappe is divided into smaller units: Przeddukielska Nappe and the Central Carpathian depression, with an anticline of Bukowe Berdo, syncline of Magurka-Stoly, anticline of Suche Rzeki and the marginal syncline.

The Silesian Nappe consists of:

- Hieroglyphic layers (Eocene) forming a complex of thin layers of flysch consisting of green silt shales and green and grey fine grained sandstone;

- Menilitic layers (early Eocene) built of hard, black and dark brown Menilitic shales with the addition of dark grey and black sandstone with muscovite;

- Intervening layers (Oligocene) consisting of a complex of grey, olive or black shales with fine grained sandstone, grey and black mudstone and yellow-grey dolomites;

- lower Krosno layers (Oligocene) built of a complex of grey medium-to-coarse grained Otryt sandstone together with thin layers of silt-marl shales.

 
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