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

N. subtilis maior). The smooth Nummulites are present with a few percent in all four profiles. Their presence forecasts their forthcoming upswing. In the generic composition of the communities the Nummulites are overwhelming (78 to 90 %). Their predominance increases from the West to the East. The genus Discocyclina in constandy present, but subordinate (5-13 %), Alveolina (15 %) and Operculina (9 %) exist in the Western Bakony, while Alveolina (2 to 11 %) in the Eastern Bakony. Each of these, but in particular the genera Discocyclina and Alveolina, are represented by quite a number of taxa. The role of these in the communities will be studied in a later stage of the ongoing investigations. 1 - N. perforatus, 2- N. brongniarti, 3 - N. variolarius, 4 - N. meneghinii, 5 - N. aturicus, 6 - N. puschi, 7 - N. sordensis, 8 - N. discorbinus, 9 - N. anomalus, 10 - N. zjrcensis, 11 - N. pen^esgyoerensis, 12 - A7. maximus, 13 - N. millecaput, 14 - N. dufrenqyi, 15 - N. praefabianii, 16 - N. striatus, 17 - N. subtilis, 18 - N. kopeki, 19 - AÍ. carpenteri, 20 - N. anomaloides, 21 - N. garniert sturi, 22 - N. praegarnieri, 23 - indet. Nummulites species Figure 4 — Geographic extension and stratigraphie position of the Nummulites communities of the Bartonian Nummulites perforatus Zone. Nummulites millecaput Zone (Figure 5) — One profile was chosen in the westernmost and another in the NE-most area of the Bakony Mountains: boreholes Somlóvásárhely 1. and Balinka 219., respectively. Core 759.9 m of borehole Sv. 1. is glauconitic sandstone. In its Nummulites community, which is of low diversity, but rich in specimens (abundance index = 4) the zone marker JV. millecaput is represented with 78 %. The big specimens of this dominant member of the community (40—50, in some cases even 60—70 mm in diameter) make the smaller ones of other taxa much less conspicuous. Reticulate Nummulites are present only in 2 %, while 4 species of striate Nummulites (JV. variolarius, JV. discorbinus, N. anomalus, JV. striatus) combined make up 18 %. The generic percentages are follows: Nummulites 71, discocyclinids 15, Assilina 11, Operculina

'3, They clay marl of the 414.5-415.8 m core of borehole Balinka 219. contains Nummulites in rock-forming quantity (abundance index = 5). The most characteristic and most important species is the smooth N. millecaput (81 %). The other 8 Nummulites species (JV. perforatus, N. brongniarti, JV. praegarnieri, JV. praefabianii, N variolarius, JV. discorbinus , JV. anomalus, N. beaumonti) are subordinate (2 to 5 % each). The generic composition of the community is: Nummulites 62 %, Discocyclina 36 %, Operculina 2 %.