Isotopic events in the early/middle badenian (miocene) of the upper silesia basin (central paratethys)

Abstract

Middle Miocene for amini fera from the Skawina Formation of the Upper Silesia Basin have been analysed. The stable oxygen and carbon isotope signatures in Globigerinoides quadrilobatus (shallow pelagic), Globigerina bulloides (deeperpelagic) and Uvigerina spp. (ben- thic) tests show a temporal pattern of changes in the sections studied. The foraminiferal as semblage biozones of the Badenian that were identified earlier, on the basis of taxonomic composition, correspond to changes in the foraminiferal δ 180 and δ 13S{cyrillic} values. The CPN7/CPN8 transition as the Moravian/Wielician border is marked by distinct isotopic events: a δ 180 increase (IIAB/IIC boundary) followed by a δ 1^ decrease (IIC/IID boundary).