Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 21. 2003. (Budapest, 2003)

34 KECSKEMÉTI, T. 414.5-415.8 m in borehole Ba. 219. The Nummulites jabianii Zone of the Priabonian is represented by the core 552.2 m of borehole Sv. 1. and interval 368.1-375.4 m in borehole Ba. 219. All the mendoned zones are assemblage zones. Location of the profiles and the representative intervals in them are shown in Figure 1. Figure 1 — Sketch map of the investigated boreholes, showing also the intervals of the representative palaeocommunities in their respective profiles. Discussion of the palaeocommunities by sections The representative Nummulites communities are presented in chronological order. Their composition, the relationships to other larger foraminfera and the trends of change are discussed below. In all figures, the palaeogeographic distribution of palaeocommunities is shown; the representative profiles are visible on both sides with the taxonomic composition of the palaeocommunities (genera and species) in the middle, in form of columns, with the respective percentages. Lutetian palaeocommunities Nummulites laevigatus Zone (Figure 2) — Tine calcareous marl sample taken at 829.0 m from borehole Somlóvásárhely 1. has yielded a very rich fauna (abundance index = 4). In its Nummulites community, the dominant species is the reticulate zone marker species N. laevigatus (70 %). It is followed by the punctuate species N lehnen, N sismondai, N. deshajesi and N. baconicus (20 % combined). The small striate species N. variolarius, N, apertus and N. suemegensis (the latter described from the South Bakony) make up only 4 %. (Unidentifiable fragments have been indicated as "others".) Along with the Nummulites, the fauna comprises also Assilina (25 %), Alveolina (25 %), Orbitolites (10 %) and Operculina (5 %). The sample taken from the interval 181.2-183.6 m of borehole Csehbánya 1. consists of sandy limestone. In its medium to high-diversity Nummulites community' (abundance index — 3-4) again N. laevigatus is the dominant species (51 %). The other half of the community- is made up mainly (to 35 %) by punctuate species (N. lehneri, N. sismondai, N. deshajesi, N. baconicus, N. obesus and N. gallensis), and (to 10 %) by N. variolarius and N. apertus. Nummulites make up 70 %, while Assilina 30 % of the fauna. The above composition characterizes only the two representative palaeocommunities. Those of the other profiles of the area are more abundant and more varied. In the profiles of the Eocene terrains extending from Ajka to Sümeg some rare "colouring elements" also occur, such as AT. britannicus and N. hagni. Comparing the palaeocommunities of the two representative profiles, it is found that the percentage of N. laevigatus in the High Bakony is much lower than in the Southern Bakony (51 % and 70 %, respectively), while the abundance and diversity (in this case simply the number of taxa) of punctuate Nummulites are higher (6 and 4 taxa, corresponding to 22 and 35 %, respectively). Also the striate taxa are more common (10 % versus 6%). As far as the community-building of the genera, it can be stated that the Somlóvásárhely 1. community is more varied