RELIEF VALLEY DEVELOPMENT OF AKKOL AND TAULTURA RIVERS DURING THE LATE HOLOCENE (SOUTHEASTERN ALTAI)
The results of the studying Akkol and Taultura rivers valleys, slowing from the greatest glaciers of the Mountain Altai (Sofiisky and Taultura) are presented. New presented data and previous researches complete the general dynamics of glacier degradation, river valleys in the upper flow of the Chagan-Uzun river during the Holocene and general chronological scale of the Southeast Altai glaciation. Fluvial deposits datings in the Taltura river valley of 630 to 1110 BP confirm the increase of the river flow off resulting in active melting glaciers during the Medieval climatic optimum. The advance of glacier of the Sofiisky glacier and the first of the end moraine of 700 BP correspond to the beginning of the Little Ice Age in the Altai. The data obtained of 4985±85 BP corroborate the conclusions of vast forest development in the middle of the Holocene on the territory of the South-Chuya ridge as well. The geomorphological structure of the region has been considered, different types of the Quaternary deposits have been established and characterized, and the limits of their spreading have been identified. The obtained results of the research, used deciphering aero- and cosmoimages of high resolution, constructed the map construction of the Quaternary deposits of 1:50 000 scale. The preparation and formation of the electron map version were done using the software ArcGIS 10. The succession, the time of deposits formation and relief forms of the Holocene age, connected with them, have been identified on the base of the analyses of geological-geomorphological of the glacial valleys joining with the obtained data of radiocarbon dating of glacial, lacustrine and fluvioglacial deposits, which allow valuation of the insensitivity of exogenic processes development in the valleys during glacier retreatment