The upcoming edition of new stratigraphic scheme of Quaternary deposits of the Altai-Sayan mountain province is based on the concept of cataclysmic draining of the Pleistocene ice-dammed lakes that occurred prior 90 ka ago (MIS-5 and earlier). Our geochronological (OSL, 14C) and paleontological data argue against excluding the Sartan cryochron (MIS-2) from the epochs of the Altai glaciogenic fluvial catastrophes. The last cataclysmically drained ice-dammed lake in the Chuya depression existed after 37 ka ago. The Kurai depression in MIS-2 was filled with water already by ~25 ka ago and was drained ~19–16 ka ago. Draining of the last ice-dammed lake in the Kurai basin correlates with the beginning of the formation of the section of catafluvial-lacustrine cyclites in the Inya River valley (the right tributary of the Katun River) 17–16 ka ago (MIS-2). Previously, in new edition of the Altai-Sayan stratigraphic scheme this section was suggested as a parastratotype of the catafluvial Saldzhar deposits with the age MIS-5. For deposits at the edge of the 70-meter “Saldzhar” terrace of the Katun River upstream the mouth of the Chuya River, OSL dates of 16–12 ka were obtained. Paleontological finds of lacustrine fauna in situ make it possible to reconsider the concept of the exclusively catafluvial genesis of the Saldzhar deposits of the 60-meter terrace of the Katun River near the mouth of its left tributary, the Sema River. OSL age 32 ka indicates the beginning of their formation not earlier than the end of MIS-3. The section, which was proposed as a stratotype of the post-Saldzhar Maloyaloman alluvium with the age 90 ka, does not meet the requirements of the Stratigraphic Code, because contact with the Saldzhar deposits has not been revealed here, and genesis of deposits is controversial. At present, the 14С and OSL dates for Saldzhar deposits and for post-Saldzhar alluvium form two non-overlapping clusters – older than 90 ka and 35–12 ka. Both insufficient geological knowledge and methodological features of dating techniques could explain this fact. Only one of the eight IRSL and OSL dates for Inya deposits, which form high (up to 300 m) bars in the valleys of the Chuya and Katun rivers, falls within the MIS-6 time, which is insufficient to establish its age as MIS-6 and older. To make correct stratigraphic reconstructions, it is necessary not only to expand a set of dates obtained by different chronological methods, but also to study the dated deposits by a complex of geological methods.