Malec J.,Polish Geological Institute and National Research Institute
Geological Quarterly | Year: 2014
Five sections from the Kielce Region of the Holy Cross Mountains and one core from a bore hole drilled in the nearby western Mesozoic Margin reveal the best recognized deposits from the Devonian/Carboniferous boundary interval. In four sections: Ruda Strawczyńska, Bolechowice IG 1, Zaręby IG 2 and Kowala, the Devonian/Carboniferous boundary is located within a continuous series of deep-water carbonates, whereas in the two remaining: Ostrówka Quarry and the Jabíonna IG 1 bore-hole, the Devonian/Carboniferous boundary interval contains stratigraphic gaps resulting from lack of deposition in sub marine conditions. The biostratigraphic position of the analyzed uppermost Devonian and lowermost Carboniferous succession is determined by assemblages of conodonts, microspores and deep-water ostracodes of the Thuringian eco type. A distinctive succession of contemporaneous fauna assemblages and lithofacies types is traceable from Holy Cross Mts. to Rhenish Massif. The main extinction occurred during a transgression-promoted an oxia, which then reverted in glycogenic regression. The anoxic conditions are well-expressed at Bolechowice and Kowala successions. © 2014, Polish Geological Institute. All rights reserved.