Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 10. 1981. (Budapest, 1981)
FRAGMENTA MINERALOGICA ET PALAEONTOLOGICA 10. 1981 p. 19-26 The possibilities of quantitative evaluation in palaeontology presented on some Upper Oligocène floras By L. HABLY (Received December 4, 1980) Abstract: Researches of recent btocoenoses result In an ever increasing number of equations wich make possible to express the characteristics of floras or faunas by means of figures. These can be divided into two groups: 1. semi-quantitative figures, referring only to species and 2. quantitative figures referring also to specimens as wt.il. From the first group the Jaccard-coefficient, the SiJrensen-index and the Kochindex, from the second group Shannon' s diversity-index, uniformity, divergencedifference, as well as the comparison by means of Horn's "overlap"-Index of three U;iper Oligocène floras will be presented. MATER LA L AND METHOD The Many Formation around Tatabánya contains a relatively rich Egerian macroflora. The greatest number of remains came from Baromállás hill between Vértesszolos and Tatabánya near to the E 5 highway. (Fig. 1). It consists mainly of leaf-impresBions amounting to 2300 pieces of about a hundred different species. The remains are embedded in clay-bearing sandstone, relatively well-preserved, oxidized, of brownish-reddish colour. There is a great number of well-preserved members of the Lauraceae family, a remarkable number of the representatives of the Taxodiaceae family, mainly Taxodium dublum (Sternberg) Heer. There is a significant number of Arctotertiary elements mainly Carpinus grandis Ung. as well as Betula and Salix species. The flora Is a characteristically Upper Oligocène mixed flora, comprising both Paleotroplcal and Arctotertiary elements. Their present-day relatives can be found mainly in South-East Asia, but a great number of them can be traced also in North America. As far as the climate is concerned it can be supposed to have been relatively warm subtropical, wich Is proved also by the relationship with the South-EaBt Asiatic flora as well as by some morphological features . The other Egerian flora has been found in Tatabánya near the Turul-clnema. The assemblage consisting mainly of leaves is embedded in a coarse-grained sandstone, giving a relatively poor preservation: in many cases even the secondary veins cannot be clearly seen. Their number is about 230, with taxa-number 42. It shows similar characteristics to the previous flora but with complete absence of needle-casts. As to flora relations and climate, similar statements can be made with not too significant differences . For example, the flora of Baromállás shows similarity mainly with that of South Japan and China, less similarity with the flora of Malaysia and Indonesia. The flora of Tatabánya resembles mainly that of the latter area. The third flora was found In Tarján from a Mghway-cut along the road to Tatabánya, and on the excavation site near it. This Is a poorly preserved flora containing a small number of leaf remains, dating also from Egerian. Like the one in Tatabánya, it has not yielded any needle-casts remains, either. As far as flora relationship and climate are concerned, on the whole, it resembles the previous ones (HABLY 1977).
