The Vagai river valley terraces

Abstract

The Vagai valley cuts three basin terraces of different age. There are II local fluvial terraces within lower reaches of the valley (150 km long) which are associated with the three basin terraces levels and the Irtysh River terraces. The valley is proved to consist of three section differing in age, their limits are basin shorelines 110 and 75-80 meters high, corresponding to two transgressions maxima. The floodplains are also of different age. The terraces are considered to be eustatic. Their typical features are association with a certain basin terrace, local extent, relative lowering upstream to the first terrace level, each terrace disappears approximately at the height of the upper limit of the next (higher) basin terrace.