On the southwestern foot of Malá Fatra Mts is the northernmost locality of the European important oak-beech habitat (Fagetum quercinum Zl. 59, Luzulo-Fagetum Br.Bl.) in the Slovak Republic. Slope on granite bedrock is 25° to 35° at an altitude of 350-550 m a.s.l. The paper presents an ecological analysis of this community according to Ellenberg ecological numbers of between 1974 and 2014 years. Succession changes over the past 40 years are reflected by a spatial arrangement of tree species. For mineral poor, medium deep to shallow oligotrophic Cambisol in tree species composition dominated by sessile oak (Quercus petraea). Less is represented by beech (Fagus sylvatica), birch (Betula pendula) and pine (Pinus sylvestris). A single occurrence of a solitary pine binds to the top of the granite cliffs where there are no conditions for the application of oak. Spatial composition of trees is the mosaic in small areas (gaps), depending on the depth of the soil and the surface stoniness. In the last 40 years, there has been no significant change of ecological characteristics in the herb layer, which reflects the relative good ecological stability of this European Important Habitat.