Dr. Nagy I. Zoltán szerk.: Fragmenta Mineralogica Et Palaentologica 2. 1970-71. (Budapest, 1971)
the basal part of the Kissvábhegy Hill + profile. These turned out to be of particular importance in delimiting the Eocene/Oligocene transitional beds and the horizon with small Globigerinidae (4 samples). The other 67 samples derive from several occurrences of the Mounts of Buda, from various levels of the Buda Marl. In small-depth hydrocarbon prospecting boreholes drilled in the Bükk Mountains foreland core sampling was done at rare and unequal intervals only. The samples contained microfaunal assemblages of rather poor conservation. Nevertheless the evidence thus gained rendered possible to correlate these formations with those of the Mounts of Buda. Charakterization of the horizons The formations studied could be divided into three levels or horizons on the basis of changes in the foraminiferal assemblages: 1. Cylindroclavulina cylindrica Zone (Upper Eocene). It comprises the basal part of the Buda Marl. The boundary between the Bryozoan "and the Buda Marls corresponds to the limit between the Globigerina gortanii-Globorotalia /T./ centralis and the Globigerina tapuriensis Zones (sensu Blow 1969). E. Szőts determined Globorotalia /T,/ centralis Cushman and Bermudez, G f /T./ cerroazulensis Cole, and Globigerina linaperta Pinlay from the upper part of the Bryozoan Marl, Accordingly it is certain that these beds belong to the Upper Eocene Globigerina gortaniiGloborotalia /T./ centralis Zone (Pl7). In the Bükk region this zone is not known to occur,as far as the plankton is concerned. In the Buda Marl the above-mentioned species are missing, while + (actual namei Martinovicshegy Hill) 8
