Ingresja morza turyńskiego (górny perm) na obszarze Monokliny Przedsudeckiej
Abstract
Turingian (Upper Permian) marine ingression in the area of Fore-Sudetic monocline
Carbonates and sandstones (Fig. 1, 2) are present below the Zechstein (Late Permian) Kupferschiefer in the Fore-Sudetic monocline (West Poland). The carbonates of the basal limestone horizon (Mutterflöz) are usually up to a dozen or so centimetres thick. They are commonly sandy and frequently contain abundant organic skeletal fragments: foraminifers (Agathammina, Ammodiscus, Nodosaria, Dentalina, Geinitzina, Frondicularia, Pseudonodosaria, Pachyphloia, and Tolypammina?), brachiopods, moluscs, echinoids, crinoids, ostracods, and bryozoans (PL III, IV). The carbonate rooks pass downwards and laterally into thin layered sandstones with abundant carbonate cement (uppermost part of the Weissliegendes). These sandstones also contain numerous biogenic fragments (Pl. I—II). Both the carbonate rocks and the sandstones rich in carbonate cement, contain relatively large amounts of glauconite (up to 4%). Below these sediments are sandstones light in colour and containing minor amounts of cement (Weissliegendes), or red sediments (Rotliegendes) (Fig. 1). The origin of the Weissliegendes sandstones is controversial (Pryor 1971a, b, Smith 1971), but the presence of an aboundant and diversified fossil assemblage evidences a normal marine depositional environment, during sedimentation of at least the uppermost part of the Weinliegendes. The foraminiferal assemblage in the Mutterflöz and Weissliegendes records low energy conditions. Therefore, the ingression and stabilization of marine conditions occurred during sedimentation of the uppermost part of the Upper Rotliegendes and/or the lowermost part of the Weissliegendes deposits. It is now impossible to distinguish marine from non-marine Rotliegendes deposits and the author proposes a return to the original use of lithofacies for delineation of the boundary between the Rotliegendes and Zechstein, that is to put it in the base of the Kupferschiefer.
Carbonates and sandstones (Fig. 1, 2) are present below the Zechstein (Late Permian) Kupferschiefer in the Fore-Sudetic monocline (West Poland). The carbonates of the basal limestone horizon (Mutterflöz) are usually up to a dozen or so centimetres thick. They are commonly sandy and frequently contain abundant organic skeletal fragments: foraminifers (Agathammina, Ammodiscus, Nodosaria, Dentalina, Geinitzina, Frondicularia, Pseudonodosaria, Pachyphloia, and Tolypammina?), brachiopods, moluscs, echinoids, crinoids, ostracods, and bryozoans (PL III, IV). The carbonate rooks pass downwards and laterally into thin layered sandstones with abundant carbonate cement (uppermost part of the Weissliegendes). These sandstones also contain numerous biogenic fragments (Pl. I—II). Both the carbonate rocks and the sandstones rich in carbonate cement, contain relatively large amounts of glauconite (up to 4%). Below these sediments are sandstones light in colour and containing minor amounts of cement (Weissliegendes), or red sediments (Rotliegendes) (Fig. 1). The origin of the Weissliegendes sandstones is controversial (Pryor 1971a, b, Smith 1971), but the presence of an aboundant and diversified fossil assemblage evidences a normal marine depositional environment, during sedimentation of at least the uppermost part of the Weinliegendes. The foraminiferal assemblage in the Mutterflöz and Weissliegendes records low energy conditions. Therefore, the ingression and stabilization of marine conditions occurred during sedimentation of the uppermost part of the Upper Rotliegendes and/or the lowermost part of the Weissliegendes deposits. It is now impossible to distinguish marine from non-marine Rotliegendes deposits and the author proposes a return to the original use of lithofacies for delineation of the boundary between the Rotliegendes and Zechstein, that is to put it in the base of the Kupferschiefer.