Ordovician stratigraphy in the Żarki-Mysłów area (NE margin of the Upper Silesian Coal Basin)

Maria Nehring-Lefeld, Bronisław Szymański

Abstract


Preliminary results are presented of studies of the Ordovician sediments in the NE margin of the Upper Silesian Coal Basin in the area of Żarki (in ENE) and Mysłów (in WSW). Structural position, lithology, main petrographic features, and results of biostratigraphic investigations of the Ordovician complex are described. On the basis or conodonts it was found that the carbonate Ordovician sequence contains sediments of Arenig, Llanvirn, Llandeilo, Caradoc and Ashgill. Sedimentary continuity between the Ordovician and Silurian is estimated on the basis of conodont succession in the profiles of the carbonate sequence found in boreholes Ż-88 and Ż-89. Attention was given to anchimetamorphosis of the Ordovician rocks as well as intensive tectonisation in the particular profiles. Incompleteness of the Ordovician profiles has been caused by tectonisation and intensive erosion of pre-Devonian and pre-Triassic age


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