To the glacial action is also due the extensive removal of the original soil from the uplands, and the accumulation of morainic hills in many localities.
This depression is occupied in great part by a series of lakes, some of these filling transversal breaches in the range, whilst others are remains of glacial reservoirs, bordered by morainic dams, extending as far as the eastern tableland and corresponding in these cases with transversal depressions which reach the Atlantic Ocean.
The Quaternary epoch is represented by vast morainic deposits in the valleys of the Tian-shan.
The coast of the Baltic is rocky only in the island-studded region at the head of the Baltic basin proper - a submerged lake-districtand the littoral generally is a typical morainic land, the work of the last great Baltic glacier.
North of the morainic belt the effect of the glaciation is seen in the irregular courses of the streams, the numerous lakes and freshwater marshes and the falls and rapids along those streams displaced by the glaciers from their former courses.