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Calcareous nannofossil biostratigraphy and paleogeographic significance in the lower Maastrichtian of the Miechów Trough (southern Poland)

Ciołko Urszula, Gaździcka Elżbieta

Acta Geologica Polonica

2022

Vol. 72, no. 3

331--352

Biostratigraphic analysis of calcareous nannofossils from the Pełczyska section in the Miechów Trough (southern Poland) has revealed that the entire section covers the lowermost Maastrichtian. The UC16bTP Tethyan subzone is designated based on the presence of Broinsonia parca constricta Hattner, Wind and Wise, 1980, reworked remains of Uniplanarius trifidus (Stradner) Hattner and Wise in Wind and Wise, 1983 and the simultaneous lack of Eiffellithus eximius (Stover) Perch-Nielsen, 1968. The studied section spans also the interval between the LO of Zeugrhabdotus praesigmoides Burnett, 1997 and the FO of Prediscosphaera mgayae Lees, 2007 (UC16 S3 Boreal subzone). Quantitative analysis of nannofossil assemblages has shown the dominance of cold water species (up to 50%), e.g., Micula decussata Vekshina, 1959, Prediscosphaera spp., Arkhangelskiella spp., Calculites obscurus (Deflandre) Prins and Sissingh in Sissingh, 1977 and Lucianorhabdus cayeuxii Deflandre, 1959. In the early Maastrichtian, the studied area was more influenced by cool water masses from the Boreal Province rather than by warm water from the Tethyan Province. The significant predominance of cold water taxa and the elevated presence of Prediscosphaera cretacea (Arkhangelsky) Gartner, 1968 also supports the hypothesis of climate cooling in the early Maastrichtian.

Płaszczowina reglowa górna (choczańska) między Doliną Lejową a Doliną Chochołowską w Tatrach

Gaździcka Elżbieta, Gaździcki Andrzej, Filipczak Karolina, Uchman Alfred

Przegląd Geologiczny

2009

Vol. 57, nr 1

56-63

The studied area contains the Middle to Upper Triassic successions of the Hronicum domain (Choč Nappe), forming at least three tectonic units. From the bottom to the top, they include: the Furkaska, the Siwa Woda and the Koryciska thrust slices. Sedimentary successions of these units differ in details, but generally they contain: the Ramsau Dolomite (Middle Anisian), Reifling Limestone interfingering with the Partnach Beds (uppermost Anisian-Ladinian), Wetterstein Dolomite (Ladinian-Lower Carnian), Hauptdolomite (Upper Carnian-Norian) and grey fossiliferous limestones of the Norovica Formation (uppermost Norian-Rhaetian). Between the Furkaska and the Siwa Woda thrust slices, calcareous and siliciclastic deposits of the Krína Nappe representing the Fatra and the Kopieniec formations(Rhaetian-Sinemurian) are sandwiched. Thus, within the Triassic successions of the Choč Nappe on the eastern slope of Cisowa Turnia (Lejowa Valley), a new tectonic unit "Pod Cisową" was proposed, which originated from Krína domain.