The application of the U / Th method allowed to reveal traces of an interstadial, which is coeval with the Brørup in the middle stream of the Ob’ River in the well-known Kirias outcrop. Description of a buried peat bog which is coeval with the Brørup interstadial, layers underlying and overlapping the Kirias section are discussed. The U / Th date was obtained from the peat bog by the methods: leachate alone (L / L) and total sample dissolution (TDS) – 105.5 + 3.6 / –3.3 Ka (L / L) and 104.4 + 4.4 / 3.9 Ka (TSD). The abundant flora (thousands of fruits, seeds, etc.) characteristic of north taiga shows the time of peat bog formation. This flora reflected the local vegetation near the swamp. Palynospectra reflect the zonality in vegetation changes. It characteristics in the beginning of peat bog formation show the development other sub-zones of taiga, followed by forest-tundra. In the layers of loam underlying and overlapping the buried peat bog, palynospectra of the non-forest periglacial vegetation of Zirianian (Early Würm) glacial time were studied.

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