Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 14. 1989. (Budapest, 1989)

The pure limestone sequence in each of the three boreholes belongs to the Middle Eocene, and the larger foraminiferous assemblages included in them represent equally five Nummulitidae assemblage zones. The tuffitic sandstone of the borehole Somlővásárhely- 1 based on its Nummulitidae fauna belongs to the Upper Eocene. Stratigraphy of the borehole Balinka-219 (NE Bakony Mts.) differs significantly from the S Bakony Mts. sections. Starting with terrestrial and freshwater (hard coal) beds, followed by brackish water sequence, predominantly clayey marl and marl can be found, continued by a marine sequence, consisting of limestones with larger Foraminifera. Zones of N. perforatus and N. millecaput are represented by this part of the section, and it belongs to the Middle Eocene. The sequence is closed by the thus continuously emerging limestone and calcareous sandstone. This stage, based on the larger Foraminifera fauna, belongs to the Upper Eocene. For purposes of bathymetrical analyses, samples from sections of the OroszlányPusztavám regions from the NE part of the Transdanubian Central Range (practically E of the Mór graben) were selected. Sections of the seven boreholes provide a strikingly differ ing picture as compared to the former ones. The more pelitic formations observed already in the NE Bakony Mts. (borehole Balinka-219) become here extremely predominant. The basal layers consisting generally of conglomerates and variegated clays are followed by coal measures of an oscillative type, even with several coal deposite. With irregular intersections of thin calcareous marl layers, the sequence is continued by marine aleurites, clayey marl and clay. The occurrence of larger Foraminifera within this pelitomorphic sediment sequence is rather changing (from scarce to ample quantities^. They are generally of little diversity and specific ecology. This sequence belongs to the N. perforatus zone. On top of the sections usually a discordance can be experienced. Usually, in the lower part of aleurite, clayey marl and clay layers glauconite can be found. For determining the depth range of larger Foraminifera the following recent sources formed the basis: MURRAY 1973, LARSEN 1976, FERMONT 1977, HANSEN and BUCHARDT 1977, LARSEN and DROOGER 1977, REISS 1977, HOTTINGER 1977, 1980, 1984. All these studies unanimously indicate that the larger Foraminifera living in subtropical-tropical environment occur in the upper part of the shelf, within a relatively limited section. The data Fig. 5 Well, studied areas where the recent ecological data are reported trom also suggest that within the fauna of a certain "habitat" larger Foraminifers are represented by 7-8, in some cases by 10-12 species. The most thoroughly examined areas are the Hawaii