Piaskowce pasiaste z warstw hieroglifowych w Jastrzębiej k. Ciężkowic
Abstract
Opisano piaskowce o charakterystycznym wyglądzie pasiastym, znalezione w środkowej części warstw hieroglifowych w Jastrzębiej, na zachód od Ciężkowic (jednostka śląska). W przeciwieństwie do dotychczas opisywanych piaskowców z warstw hieroglifowych jednostki śląskiej, zawierają one liczne wapienne szczątki organizmów nerytycznych. Pozycją stratygraficzną i wykształceniem nawiązują do wapieni pasieczniańskich jednostki skolskiej, do piaskowców ze środkowych warstw hieroglifowych jednostki dukielskiej oraz do piaskowców pasierbieckich jednostki magurskiej.BANDED SANDSTONES OF THE HIEROGLVPH BEDS AT JASTRZĘBIA NEAR CIĘŻKOWICE Specific sandstones occurring in the Hieroglyph Beds of the Silesian Unit at Jastrzębia, Carpathian Mts (Figs. 1, 2), are described. The sandstones, banded in appearance (Table 1, Fig. 5), differ from those hitherto described from the Hieroglyph Beds of the Silesian Unit in high content of calcareous elements. The banded sandstones represent coarse-to fine-grained, medium-bedded turbidite sandstones, mainly built of quartz and calcareous components. Minor components include pyrite and carbonized plant detritus as well as giauconite, muscovite, single feldspars and heavy minerals. Detrital components are cemented with CaC03 and, in some parts, silica. Calcareous components include intraclasts of micritic limestones, remains of molluscans, echinoderms, coralline algae, bryozoans and some organisms of unidentified taxonomic position (Table 1, Figs. 3, 4, 6). Shales intercalating the above sandstones yield microfauna indicative of Middle Eocene age of the strata (Table 1; H. Jurkiewicz, 1967). Organic remains occurring in the banded sandstones represent redeposited Middle Eocene biocoenosis of nearshore parts of the Silesian basin (0. Samuel et aI., 1972). Similar strata are known from the Middle Eocene of the Skole (F. Bieda, 1927), Dukla (A. Ślączka, 1971) and Magura (F. Simpson, 1970) units. Deposition of these strata corresponds to the times of vivid development of organic world in nearshore zones of basins in the Carpathian geosyncline.Downloads
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2013-04-30
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