Permian to Early Triassic magnetostratigraphy from the Central European Basin in Poland: Implications on regional and worldwide correlations

Permian–Early Triassic rocks sampled in 15 outcrops (93 hand samples) and 11 unoriented boreholes (630 hand samples) from the Polish part of the Central European Basin were studied paleomagnetically. In spite of extensive remagnetization, affecting 50% of samples from the boreholes, a magnetic polarity sequence was compiled. The polarity pattern is not only common for many sections from the investigated area but also convergent with the global synthetic magnetostratigraphic scale. The Lower Rotliegend (Early Permian) rocks contain a reversed polarity record, while the Upper Rotliegend (Late Permian)–Early Triassic sediments are characterized by mixed polarity magnetization. Within the Buntsandstein part of that mixed megazone 14 magnetic zones were found. Buntsandstein sedimentation started with a normal polarity zone, which may be compared with that of Early Griesbachian defined in several places in the world. The polarity record noted in the Middle Buntsandstein sediments could indicate significant stratigraphic gaps or condensations near the Middle Buntsandstein and Röt boundary. The comparison of the Upper Buntsandstein polarity with the Early–Middle Triassic magnetostratigraphic data from other basins suggests that the majority or even all the Röt sediments should be included in the Anisian.