Abstract The samples came from the NW part of Budapest, from Zsolt fejedelem útja at Budaliget (II. district), from the ex-bricfactory; and from Ph-4-, Ph-9- and Ph-24 boreholes. The collected samples were separated according to the quantitative foraminiferal studies. 300 specimens were chosen from each samples, and those were identified according to the preservation at specimes, minimum generic level. The samples came from Kiscell Clay Formation and Törökbálint Sandstone Formation Solymár Sandstone Member. The samples can be divided into 2 groups according to their faunas: Heterolepa costata community which has big diversity. It is typical for Kiscell Clay; Trochammina asagainensis community, which has low diversity. It is Typical for Solymár Sandstone. The age of the foraminiferal fauna is upper Kiscellian, lower Egerian (zone NP24 and NP25) (Horváth, 1981, Nagymarosy, 1974). The palaeoecological studies based on recent analoges and mathematical methods. A simplified ternary diagram were used according to Murray (2006). The foraminifera fauna of the assemblages lived in normal marine sea. A The assemblages from Solymár Sandstone deposited at marginal sea environment, assemblages from Kiscell Clay deposited in bathyal depth by the Fischer α-index and H-index. The low values of plankton-benthos ratio refers the closeness of the cost. Ternary diagram of feeding supports the shelf and upper bathyal region. Those depths were confirm by the ratio of epi- and infauna. The cluster analysis present very well those two environment. References Horváth, M. (1981): Adatok a Mányi Formáció és a Solymári Homokkı Tagozat foraminifera-faunájának ismeretéhez. Földtani Közlöny, 111, 523-528. Murray, J. W. (2006): Ecology and Applications of Benthic Foraminifera. - Cambridge University Press, Cambridge, 426 p. Nagymarosy, A. (1974): Az észak-budai kiscelli agyag összefoglaló fáciesvizsgálata. Szakdolgozat, kézirat.