ABSTRACT
Basal till occurs within the limits of the Dnieper ice stream and the Polesian lobe as a sediment cover. The individual till sheets are distinguished by scale, configuration and mode of occurrence. In comparison with the Dnieper ice stream, the West Polesian lobe was a much smaller structure. If only the outward form of the feature is considered, it may be thought of as a lobate extension in the uneven ice sheet margin. The so-called ‘mature’ variety of ‘monolithic till which can be easily recognised in both outcrops and cores, is the most frequent till type in the Dnieper ice stream area. Particle-size distributions for ‘mature’ basal till, especially the fine material content, are variable over the Dnieper ice stream area. In the Dnieper ice stream area, ‘schollen tills’ occur locally. They are associated with abrupt breaks in the glacier bed profile and with areas of uneven, rugged topography.
