Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 10. 1981. (Budapest, 1981)

p

} = : the relative frequency of the 1-th species in the first flora n

i p' = TS" : the relative frequency of the i-th species in the second flora I N The measure of the value of the fraction in the equation is bit/individuum

. If we multiply by N we obtain the diversity of the flora: Hp = H" . N; the measure unite is bit. Applying further the above equation we can compute the diversity difference of the three floras at the same time. H" + H'* + H'

' H,.„ = - H. diff t 3 H

t

= 3 l

°h 3 The Horn (HORN 1966) "overlap" equation was obtained through several formulae with the help of information theory. o X + Y . loggXfY - Xlog

2

X - Ylog

2

Y Ro : the Horn overlap value xi : the frequency of the 1-th species in the first flora yj : the frequency of the i-th species in the second flora X : the total of frequencies in the first flora Y : the total of frequencies in the second flora The above methods grant possibility for a more objective evaluation, and for a simpler, quicker and more exact comparison of fossil floras and faunas. BAROM ALL AS TATABANYA TATABANYA TARJÁN BAROM ALLAS TARJÁN 7j V/, Fig. 2. Comparison of the three floras by means of semi-quantitative method. The tendency of similarities is the same on the basis of Jaccard and Sjrfrensen-index. The greatest similarity could be seen between the VérteBszőlős (Baromállás) and Tatabánya, the least similarity is between the Vértesszolos (Baromállás) and Tarján floras