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
Finland–Russia relations Finland–Russia relations Finno–Russian relations have been conducted over many centuries, from between Sweden and Russia in 1700s, to the planned and realized creation and annexation of the Grand Duchy of Finland within the Russian Empire during Napoleonic times in 1800s, to the dissolution of the personal union between Russia and Finland after the abdication of Russia's last czar in 1917, and subsequent birth of modern Finland, with support of the bolshevik (Soviet) Russian government. Finland had its own civil war with minor involvement by Soviet Russia, was later invaded by the USSR, and had its internal politics influenced by it.