Attempt for Upper Cretaceous planktic foraminiferal zonation of the Srednogorie and Eastern Balkan Zones (Bulgaria)

Abstract

Thirteen biostratigraphical zones were defined as a result of summarizing of the available data on the taxonomy, stratigraphical range and occurrence of the Upper Cretaceous planktic foraminifera from the Srednogoriå and East Balkan. The zones are: Rotalipora cushmani Taxon Range Zone (Late Cenomanian), Dicarinella imbricata Interval Zone (Early Turonian), Marginotruncana renzi – Marginotruncana sigali Interval Zone (Middle Turonian), Marginotruncana schneegansi Interval Zone (Late Turonian), Dicarinella primitiva Interval Zone (Early Coniacian), Dicarinella concavata Interval Zone (Late Coniacian to Early Santonian), Globotruncanita elevata Interval Zone (Early Campanian), Globotruncanita stuartiformis Interval Zone (Early Late Campanian), Radotruncana calcarata Taxon Range Zone (Late Late Campanian), Globotruncana falsostuarti Interval Zone (Early Maastrichtian), Contusotruncana contusa Interval Zone (Early to Late Maastrichtian), Abathomphalus mayaroensis Taxon Range Zone (Late Late Maastrichtian). The zones were successfully correlated to the biostratigraphical schemes in the Carpathians, Mediterranean Basin, Caribbean Basin, and some generalized zonations.