The study of the foraminiferal communities from the Paleogene–Neogene reference section at Kvachina Bay in West Kamchatka has made it possible, based on the qualitative composition and the quantitative ratios of the encountered species, to identify 13 layers with foraminifera corresponding to certain intervals of the section and to establish their successive change. The foraminiferal layers are combined into four complex zones. In terms of the distribution scale, the identified zones are regional and are traced in the adjacent regions. The change in the paleocommunities corresponds to the process of evolutionary development of foraminifera, as well as to a change in paleoenvironments. The changes recorded in the composition and the structure of zonal communities are reflected in the stage character of microfauna development.