In this article the technique of classification of the Early Holocene microblade industries on sites with mixed cultural layers of Central Yakutia (Tuymaada Valley) is discussed. This technique is based on classification in the complexes of stone artifacts of microliths, as a characteristic for the Sumnagin Culture.

Materials from sites are associated with the Mesolithic on the basis of the technical-typological and statistical analysis of tools and their comparison with materials from precisely stratified sites of the Sumnagin Culture of the Aldan and Olekma river basins. The stone inventory of the Sumnagin Culture is based on the maximal use of blades from which practically all stone tool industrial products were produced, except for large cutting instruments. The presence of microblade tools in the common statistics of tool types is supported by a big amount of blades and the tools made of them. Prevailing amount of blades in relation to flakes, blade tools in relation to the flake tools, absence of ceramics or its small amount, in same cases, also testifies in favour of early dating. On the basis of analysis, the Sumnagin cultural complex on 11 sites of Tuymaada Valley is established: Kapitonovka, Kil’dyamtcy III, Severo-Zapadnaya II, Fermennoe Ozero, Syrdakh VI, Zernovaya II, Us’-Khatyng I, V, Vladimirovka IV, Horo I, III. On about 25 sites where the microblades industries are excavated, at expansion of works, the assumption of presence the Mesolithic stone assemblage in cultural layers can prove to be true.