RECORD OF LATE PLEISTOCENE GEOLOGICAL EVE NTS IN WEST SIBERIA

Stratigraphically the Upper Pleistocene is ranked the upper member of the Quaternary. This member is subdivided into four climate-stratigrap hic horizons: interglacial - Kazantsevo and Kargino, glacial - Ermakov o (Early Zyrjanka), and Sartan (Late Zyrjanka). The Kazantsevo horizon (Aem) and three subsequent horizons are united into the Zyrjanka supe rhorizon (Weichselian). The Kazantsevo interglacial horizon is represe nted by marine and alluvial, more rarely lacustrine, deposits and pale osoils. The maximum of transgression is dated by EPR from the interval 134.8-121.9 ka ago, and the climatic optimum in the continental serie s is established by TL within 130+/-25-130+/-31 ka ago. The Ermakovo a nd Sartan glacier horizons include formations of Ermakovo and Sartan g lacial complexes, glacier-dam lacustrine and subaerial deposits. Radio metrically, they date from the ranges 100(110)+/-17 (27)-55(60) and 23 (22)-10 ka ago, respectively. Two interstadials at about 80 and 65 ka have been recognized within the Ermakovo glaciation. Most likely, they correspond to Ammersforth (Fana) and Odderade (Brerup) interstadials. The Kargino interglacial (megainterstadial) horizon is radiometricall y dated by 55(60?) to 23(22) ka ago and combines marine and alluvial a s well as stadial Lokhpodgort glacial (about 35(33)-30 ka ago), lacust rine-glacial, and subaerial deposits. The Sartan glacial complex is co mposed of moraines of the maximum Gydan (= Salekhard-Uval) and two rec essive Nyapan (= Sopkei) and Norilsk (= Polar-Uralian) stages. The gla ciation was culminated at 20-18 ka ago; the Nyapan and Norilsk stages are dated by 15-13 ka and 11.5-10.4 ka, respectively. The glacier-dam lakes can be traced by relict terraces: Ermakovo 100-120 m high and Sa rtan 60-80 m high, dated from about 75-80 and 23(22)-12.8(12.3) ka, re spectively. A sea ingression occurred in the late glaciation (about 13 -11 ka ago). In taxonomy of foraminifers, the marine Kazantsevo beds a re comparable with the Aem of Western Europe. Taking into account radi ometric datings and paleomagnetism (Blake episode), the Kazantsevo hor izon may be identified as substage 5e of the isotope-oxygen scale. As a result, safe support is given to the comparison of the Ermakovo and Sartan (Lower Zyrjanka and Upper Zyrjanka) glacial horizons and Kargin o megainterstadial horizons with the Lower Weichselian, Middle Weichse lian, and Upper Weichselian (Wiirm) of Western Europe as well as with stages 4, 3, and 2 of the oceanic scale.