Early Cretaceous foraminifera fauna from Bersek Hill, Gerecse Mts, Hungary

This is the first investigation on isolated Early Cretaceous foraminifera fauna from Hungary. The fauna was set free by concentrated acetic-acid from calcareous layers and by hydrogene peroxide from silty layers of Bersek Marl and Lábatlan Sandstone Formations in Gerecse Mts, Hungary. The foraminifera indicate a Valanginian – Barremian age of this succession which is well correlated with data based on ammonite and nannoflora stratigraphy. Family Vaginulinidae is the most abundant and the most diversified, Lenticulina nodosa (REUSS), L. muensteri (ROEMER) and Glomospira gordialis (JONES et PARKER) are the dominant species. The composition of foraminifera assemblages suggests that Bersek Marl and Lábatlan Sandstone Formation were formed in outer shelf – upper slope environment, where the intensity of paleocurrents influenced not only the kind of sediments but the distribution and preservation of microfauna