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Fig. 3. The thickness (in m) of Holocene deposits in various part of Vistula River valley (acc. to Starkel 2001). 8,7 - average thickness in m. of Holocene deposits in Vistula River valley

Miąższość (w m) holoceńskich osadów w różnych częściach doliny Wisły (wg Starkla 2001). 8,7 - średnia miąższość w metrach holoceńskich osadów w dolinie Wisły

The last possibility is rather a rare case, and very difficult to recognize. The buried ice-marginal valleys are located mainly parallel to ice-sheet front and they have W-E direction. They are broad and infilled with fluvial deposits in part only.

The fluvial valleys and subglacial channels are similar in their direction and depth, and they have very often a similar paleorelief which is visible in various parts of the Pleistocene cover.

But in some cases the differences are significant. Anyway the subglacial channels have longitudinal profiles with uneven bottom, rather smali breadth and their infilling consists of glacifluvial minerał deposits, mainly sand and gravel with thin redeposited till lenses. At figurę 5 as an example of subgla-