Abstract

The areal stratotype of the Chibit glaciation is characterized in the stratigraphic scheme of the Quaternary deposits of the Altai-Sayan mountainous region, corresponding to the last glacial maximum, i.e. the fourth stage of the Upper Neopleistocene of the Russian stratigraphic chart. The reference geological sections of the diamictons of the Chibit horizon are described. A Paleogeographic map showing the area of the Chibitsky and Maasheysky glaciers during the LGM is presented. The map was compiled on the basis of remote sensing materials, field geomorphological observations and field geological data. The boundaries of the glacialdammed Baratal Lake are shown based on flooding level of 1700 m. This level corresponds to the upper terraces on the northeastern edge of the Kurai depression. The boulder-gravel deposites formed as a result of the Baratal lake breakthrough were identified in the old valley of the Chuya River. They compose the 57 m high terrace, that is cut into the Chibit moraine. It has been established that the Chibit moraine is embedded into the Saldzhar superflood sequence. Therefore, the Saldzhar and Baratal outbursts are of different ages and scales.

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