Bio-events, foraminiferal and nannofossil biostratigraphy of the Cenomanian/Turonian boundary interval in the Subsilesian Nappe, Rybie section, Polish Carpathians

摘要: Abstract The Rybie section (Subsilesian Nappe, Polish Carpathians) comprises hemipelagic and pelagic sediments of the Cenomanian/Turonian boundary (CTB) interval. In general, positioning CTB in such is problematic owing to absence or scarcity index ammonites inoceramids, but an integrated stratigraphy nannofossils, foraminifera microfacies allowed determination within a narrow standard nannofossil UC zones have been used, planktonic foraminiferal Thalmanninella reicheli Zone combined with new local zonation, which includes Parathalmanninella micheli , Heterohelix Marginotruncana proposed. A few bio-events related were identified, including shift, radiolaria domination, roveacrinid abundance event, turnover, deep-water agglutinated extinction filament event. interval lies lower part UC5c-6 Zone, middle benthonic Bulbobaculites problematicus Zone. also above event below between package black shales (an equivalent Bonarelli Level) level ferro-manganese deposits.