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 which there is a maritime boundary between the respective territorial waters, terminating in a narrow strip of international waters between Finnish and Estonian territorial waters. The first border treaty concerning this border was signed in Nöteborg in 1323, between Sweden (to which Finland belonged) and the Novgorod Republic. The Treaty of Teusina in 1595 moved the border eastward. In conclusion to the Ingrian War, Sweden gained a large tract of land through the acquisition of the Nöteborg fortress, the Kexholm and its large province, southwest Karelia and the province of Ingria in the Treaty of Stolbovo (1617). The Treaty of