Abstract
From the investigations in the East Balkan area, south of the trust and nappe of the Balkan Mountains until now only on the coast of the Black Sea there has been found a real Cretaceous/Tertiary (T/K) boundary. Cretaceous/Tertiary boundary sections in Bulgaria on the coast of the Black Sea near Bjala, 35 km south of Varna have been identified by micro- and nannofossils, magnetic reversals and event markers. The hemipelagic sediments of profile Bjala 2b and Bjala 2c show an iridium enrichment in the boundary clay, a minimum of CaCO3, shocked quartzes, a mass extinction of Cretaceous nannoplankton species, as well as a bloom of survivors at the K/T boundary and the first appearance of new nannoplankton species after the K/T event. The comparison of biostratigraphic and magnetostratigraphic results provides a time scale for the evolution of these new nannoplankton species.
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