The study of deep marine sediments of Jurassic and Cretaceous boundary interval on Bruzovice profile

 

Petr Skupien, Jakub Ryba, Pavlína Doupovcová

Geoscience Research Reports 49, 2016, pages 209–213
Map sheets: Karviná (15-44)

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Published online: 30 September 2016

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Abstract

New outcrop of the Jurassic/Cretaceous boundary sediments of the Silesian Unit of the Outer Western Carpathians was studied. The section is situated as natural outcrop on left river bluff near Bruzovice village (Fig. 1). Lower part of the section (Fig. 2) is formed by the uppermost part of the Vendryně Formation, which is represented by dark grey calcareous claystones with concretions and blocks of limestones. Limestones represent gravels, blocks and concretions of size at least 1.5m in size. Limestones are predominantly micritic, grey to dark grey in colour, some of them are spotted. A very small part of limestone gravels are organodetritic. These again are grey to dark grey, often with spines of echinoderms and bivalves on the surface. Accumulation of limestones can be compared with the Ropice horizon, which occures in the uppernost part of the Vendryně Formation. Claystones of the Vendryně Formation provided a relatively poor association of non calcareous dinoflagellates with Circulodinium distinctum, Cometodinium sp., Cribroperidinium sp., Endoscrinium sp., Gonyaulacysta sp., Stiphrosphaeridium anthophorum, Systematophora areolata, Tubotuberela sp., Valensiella sp. The Dinoflagellate cyst association is of late Tithonian age.
Upper part of profile is represented by the lowest layers of Těšín Limestone, formed by limestones, claystones and marlstones. The micritic limestones provided determinable and stratigraphically important microfossils (Fig. 2). Representatives of calpionellids Calpionella alpina (Lorenz), Calpionella grandalpina (Nagy), Crassicollaria massutiniana (Colom), Crassicollaria parvula (Remane), Tintinnopsella carpathica (Colom), Tintinnopsella doliphormis (Colom) and calcareous dinoflagellates Cadosina semiradiata fusca (Wanner), Cadosina semiradiata cieszynica (Nowak), Cadosina semiradiata semiradiata (Wanner), Colomisphaera fortis (Řehánek), Colomisphaera radiata (Vogler), Colomisphaera lapidosa (Vogler) were determined. The association of calpionellids is typical for the uppermost Tithonian to lower Berriasian age.