The goal of this research consists in demonstration of transitional periods in the dynamics of European culture, defined as sociocultural transformation, as the basis for its periodization. The article indicates that namely sociocultural transformations, i.e. transitional eras, play a crucial role in the historical-cultural process. In the dynamics of European (Euro-Atlantic) culture, the author determines the three sociocultural transformations: late Hellenism, Renaissance and Reformation, avant-garde and postmodernity. They divide the cultural continuum of the countries of European (Euro-Atlantic) civilization into three stages of gradual development: antiquity, medieval, and modern European. The key research method is the philosophical interpretation of the knowledge on cultural heritage of the European (and later Euro-Atlantic) culture. It is underlined that sociocultural transformations manifest as a condition for the creative process in its classical meaning (emergence, consolidation, and distribution of the new), and the key for cultural continuity, although the contemporaries often consider it as “shifting away from the norm”. In the intervals (sociocultural transformations) of gradualism (cultural systems) underlies the guarantee of continuity of the historical-cultural process.