Globotruncanidae zones in the Upper Cretaceous within the Tara Birsei area (Crystalline-Mesozoic zone, Eastern Carpathians)

Abstract

In the Tara Birsei Region the Cenomanian-Maestrichtian is developed mainly as a continuous marly series. Abundant planctonic Foraminifera which occur in this series allow to study the evolution of the Globotruncanidae assemblages and to distinguish the Globotruncanidae zones. The Globotruncanidae zones distinguished here are correlated with those differentiated by J. Sigal in the Mesogean area. Paleontological part of this paper contains the descriptions of species belonging to the subgenus Thalmanninella.