Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 14. 1989. (Budapest, 1989)
(related to Alveolina^, Sorites and Am phiso rus (related to Orbitolitesl and Arriphistegina lessoni. The investigations were carried out on Eocene formations of the Transdanubian Central Range, thus the reconstruction of depth refers to the Eocene. For the analyses sections that span over possibly larger time-intervals were selected. Most of them are borehole sections. Of the several sections only a few will be discussed in detail, first of all those that sufficiently cover the Transdanubian Central Range topographically, and are also properly studied from paleontological and sedimentological points of view (BERNHARDT et al. 1985, KECSKEMÉTI 1982) (Fig. 1). Besides, data of several other sections are also integrated, but the accuracy of the results is based on selected sections. These are the boreholes Somlóvásárhely-1, Devecser-4, Csabrendek2, Balinka-219, Oroszlány-2291, 0-2274, O-2210, 0-2266, O-2301, 0-2361 and O-2370. Their stratigraphy is shown in Figs. 2-4. Fig. 1 Topographic map of the studied localities S Bakony Mts. is represented by three boreholes: Somlóvásárhely-1, Devecser-4 and Csabrendek-2. Stratigraphical columns of these three boreholes are practically the same: they reflect the same lithology, fauna and refer to identical ecological conditions. All of them start with a terrestrial detritic phase, followed by the appearance of a scarce marine fauna, transgression also appears. This, by the beginning of the Lutetian, corresponds to the emerging of the fauna of the N. laevigatus zone. The thick pure limestone with great larger Foraminifera-contents developing upwards refers to a marine environment. The limestone contains a varied larger Foraminifera fauna that, in certain phases, may act as rock-forming agents. A particular section of unanimous limestone may be observed as the "reef-limestone" of Csabrendek, that could not be found from the neighbouring sequences. In the limestone a glauconicity tendency starting in the N. perforatus zone, tending upwards, may be observed. The limestone, by the gradual disappearance of the larger Foraminifera, turns into limy, followed by clayey marl. The sediments become more pelitic, with an ever increasing quantity of rock-forming planktonic Foraminifera. In case of the boreholes Devecser-4 and Csabrendek-2 planktoniferous clayey marl closes the sequence, while at the borehole Somlóvásárhely-1, upon the clayey marl, tuffitic sandstone with larger Foraminifera content differring from that of the limestone is deposited.
