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 border Finland–Russia border The Finnish–Russian border is the roughly north/south international border between the Republic of Finland (EU member) and the Russian Federation (CIS). Some 1,340 km (833 miles) long, it runs mostly through uninhabited taiga forests and sparsely populated rural areas, not following any particular natural feature or river. It is also part of the external border of both the political and economic union; European Union (EU) and the loose confederation; Commonwealth of Independent States (CIS). Border crossings are controlled and patrolled by the Finnish Border Guard and Border Guard Service of Russia, who also enforce border zones (0.1–3 km