Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
Albian-Cenomanian boundary in the depositional area of Silesian Unit according to study of foraminifer and calcareous nannofossils (Outer Western Carpathians, Czech Republic)
AbstractThe study of foraminifers and calcareous nannofossils from isolated samples of Cretaceous pelitic sediments from Stramberk-Kotouč quarry and the abandoned quarry of Jasenice was concentrated on the Albian and Cenomanian assemblages. Mostly poor and badly preserved Albian foraminiferal and nannofossil associations and more diversified Cenomanian ones contain important species to determine the Albian-Cenomanian boundary. Late Albian is marked by the last occurrence of foraminiferal species Ticinella primula and by the first occurrence of Gavelinella cenomanica. On the basis of calcareous nannofossils the first occurrences of Eiffellithus monechiae, E. turriseiffelii and a short stratigraphic range of Arkhangelskiella antecessor (BC27/UC0b) are important for the upper part of Late Albian. Early Cenomanian deposits has been identified by the presence of representatives of foraminiferal genus Rotalipora and by the first occurrences of calcareous nannofossils Prediscosphaera cretacea (BC27/UC0c) and Corollithion kennedyi (UCla).