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 on 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 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 the flake tools, absence of ceramics or its small amount, in some 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'dyamtsy III, Severo-Zapadnaya II, Fermennoe Ozero, Syrdakh VI, Zernovaya II, Us'-Khatyng I, V, Vladimirovka IV, and 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.
Работа посвящена проблеме изучения мезолита в Центральной Якутии. Здесь было известно небольшое количество стоянок сумнагинской культуры, характеризующихся смешанными культурными комплексами, и датированных этим временем лишь по аналогиям инвентаря. В работе предложена методика определения раннеголоценовых комплексов в смешанных культурных слоях, основанная на выделении в общих комплексах каменного инвентаря микролитов, в большей степени характерных для сумнагинской культуры. Проведённый анализ позволил выделить сумнагинский культурный комплекс на 11 памятниках Туймаады. На ещё около 25 памятниках, где обнаружены микропластинчатые индустрии, при расширении работ, может подтвердиться предположение о наличии в культурных слоях мезолитического каменного инвентаря

The Dst-index obtained by hourly average values of the magnetic field at four stations located in various longitudinal sectors at latitudes Φ′≈20-30° is the index of magnetic field depression at low latitudes during the magnetic storm periods. Recently for the characteristics of magnetic field depression the SYM-H index has been used. It is obtained from 1 min data of the magnetic field at ~10 stations, located mainly at latitudes Φ′≈40-50° [1]. It is considered in [2-4] that the SYM-H index is an analog of Dst but with a better temporal resolution. As shown in [5], during super magnetic storms with Dst variation ≥ 400 nT, the SYM-H variations can considerably differ from Dst behavior and thus the SYM-H index is not always an analog of Dst. In this paper the relation between the Dst and SYM-H variations for magnetic storms of different intensity, with Dst varying from ~ -50 nT to -450 nT is investigated.