The Belyi Yar-2 key section (51°42' N, 102°37' E) located in the eastern part of the Tunka rift basin is a well known sequence but its chronology is discussible question up to now. The upper 13-15 m of the outcrop is composed by sands and the underlying lacustrine-alluvial deposits ~2 m thickness contain organic-rich layers. In the 60-s of the last century it was considered that these organic-rich layers were formed throughout the Early Pleistocene (Ravskyi, Golubeva, 1960). Later their age was correlated with the Late Pleistocene (marine isotope stage 3, MIS-3) (Adamenko et el., 1975; Shchetnikov et el., 2015). Latter conclusion was based on a number of 14C dates from ~41 kyr to ~26 kyr of vegetation remnants and bones. Our study was addressed on clarification of numerical age and environmental conditions of the lower part of the Belyi Yar-2 formation. The organic-rich samples were collected in 2013-2015 from the lower lacustrine-alluvial layer ~1.6 m thickness. The samples collected in 2013 yielded the fini