Abstract
PETROGRAPHIC STUDY OF THE MIDDLE DEVONIAN ŚWIĘTOMARZ BEDS OF THE HOLY CROSS MOUNTAINS AND THE ŻNIATYŃ MEMBER FROM THE SE LUBLIN AREA Abstract. In the Holy Cross Mountains, Middle Givetian terrigenous deposits occur only in the Łysogory region. In its eastern part they are found between claystones of the Skaly Beds and biostromal limestones of the Pokrzywianka Beds, whereas in the western part – between claystones of the Skaly Beds and the Nieczulice Beds. These deposits are ascribed to the Świetomarz Beds and consist of mudstones and sandstones reaching about 100 m in thickness. The sandstones are comprised of fi ne-grained quartz arenites, calcareous quartz arenites, rare sublithic arenites, quartz and sublithic wackes, being subordinate to laminated mudstones with plant remnants. The same petrographic characteristics are exhibited by the Żniatyn Member known from the Terebin IG 4 borehole, SE Lublin area. The sources of detrital material for the Świetomarz Beds and the Żniatyn Member were a recycled orogen built of siliciclastic rocks, and a cratonic zone of continental block. The terrigenous material was supplied to the Middle Devonian Łysogory basin from the south-east through a deltaic system. The depositional environment was a proximal and distal area of prodelta that prograded to the west.
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