Glacial formations have been studied in the central part of the Siberian Spurs, West Siberia. Many researchers correlated them with the Taz stage of the Samara (maximum) glaciation, or with the first Late Quaternary (Zyryanka) glaciation. Analysis of the data obtained suggests that these glacial formations are represented by subaerial forms. They are left by a glacier whose margin was situated on land and, when hypsometrically below 125 m, in a shallow-water near-glacier lacustrine basin (Mansi). Well-preserved glacier forms, moraines lying immediately on the surface, and no boulder-free sediments covering the glacier boulder-containing deposits suggest that the marginal glacial formations of the Siberian Spurs are left by the last, Sartanian (Late Wurmian) glacier. This age is also indicated by the absence of the Karga-Sartanian fluvial terrace in the valleys of northern West Siberia. The glacial depressions left by ice flows are as follows: Ob', Polui, Nadym, Pur, Taz, and Yenisei. They are bordered on the south by arcuate bands of marginal glacier forms.
