¹⁴C-dating and palynological studies of the Kirias section (the midstream Ob River), which is a stratotype of Kiriasian layers of the Karganian horizon, have shown that the lower part of this section, which earlier had been believed to belong to the Karganian horizon, is of the Zirianian age. Lower layers of the Karganian horizon occur much higher. Palynological studies of Karganian deposits in the Kirias section allowed to distinguish nine palynocompexes, including two palynocomplexes of pre-Karganian and two palynocomplexes of post-Karganian (Sartanian) deposits. Palynological data showed that in the Karganian time vegetation in the Kirias region changed from open woodland of northern taiga to open woodland of forest taiga in warming stages of the Karganian time and reached the parameters of tundra (or transition from forest-tundra to tundra) in cooling stages. Late in the Zirianian and early in the Sartanian glacial time, vegetation changed from tundra to tundra-steppe. Displacement of vegetation zones to the south could exceed 800 km in the time of cooling and reach 300–600 km during the Karganian warming.

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