Geology of Finland subsequent uplift and erosion would have eroded all of these sediments. In Finland, Caledonian nappes overlie shield rocks of Archean age. Despite occurring in about the same area the Scandinavian Caledonides and the modern Scandinavian Mountains are unrelated. The ice sheet that covered Finland intermittently during the Quaternary grew out from the Scandinavian Mountains. By some estimates the Quaternary glaciers eroded away on average 25 m of rock in Finland, with the degree of erosion being highly variable. Some of the material eroded in Finland has ended up in Germany, Poland, Russia and the Baltic states. Ground till left by
Poland–Russia border Soviet Union (USSR), shaped during the Polish-Soviet War, and confirmed at the Treaty of Riga at the line Dzisna-Dokshytsy-Słucz-Korets-Ostroh-Zbrucz. That border was long. Following World War II, the new border (see territorial changes of Poland immediately after World War II) was drawn between the People's Republic of Poland and the USSR. The new Polish-Soviet border was long at first, and subject to a minor modification in the 1951 Polish–Soviet territorial exchange, which reduced the border length to . The modern border between Poland and Russia is regulated by a number of legal documents, many of them dating to the times