Abstract
Detailed lithological study of tills was carried out at exposures along the Adz’va, Bol’shaya Rogovaya, and Seida rivers—northern tributaries of the Usa River—in the northeasternmost area of the Timan-Pechora-Vychegoda region. The results of grain size, mineralogical, and petrographic analyses coupled with measurements of orientation of elongated clasts in tills made it possible to substantiate the presence of three moraine horizons. Lithological features of the Pechora (Dnieper) and Polyarny (Ostashkovo) horizons of tills testify to the input of terrigenous material from Novaya Zemlya. The upper (middle Pleistocene) till, which is also as defined as the Vychegoda (or Moscovian) till, represents clastic material derived from the Polar and Subpolar Urals. Lithological properties have been defined for the stratification and correlation of tills. A chart of lithological criteria has been compiled for the subdivision and correlation of middle and upper Pleistocene tills in the Far Northeast of European Russia.
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