THE AGE AND VOLUME OF THE KOCHKOVSKY HORIZON (EOPLEISTOCENE OF WEST SIBERIA)

V. S. Volkova, O. B. Kuzmina, I. V. Khazina

Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia

Due to the change in the Quaternary system base down to the level of 2.588 (≈2.6) mln years, revisions were suggested to be introduced to the new version of the Regional Quaternary Stratigraphic Chart of the West-Siberian plain. The volume and age of the Kochkovsky regional horizon were analysed. Based on palynoflora, the lower portion of the horizon (Kargat Formation, lower Barnaulskaya Formation) is recommended to be included in the upper Gelasian Stage, with designating it as the Kargatsky horizon. The upper portion of the Kochkovsky horizon (Ubinskaya Formation, upper Barnaulskaya Formation, Erestninsky beds) is suggested to leave in the Eopleistocene, with designating these deposits as Ubinsky horizon. The name “Kochkovsky” is proposed to keep as a suprahorizon’s name in the new generation Quaternary Stratigraphic Chart of the West-Siberian Plain.

Key words: Kochkovsky horizon, Kochkovsky suprahorizon, Kargatsky horizon, Eopleistocene, Gelasian Stage, palynological data, West-Siberian plain.

DOI 10.20403/2078-0575-2016-4-3-8