The Urals are the mountains bisecting the map from north to south, formed by
a Paleozoic collision between Baltica and the Siberian Craton. The vast blue
area west of the Urals is Permian rocks. The Permian Period was named in 1841 by
Roderick Murchison, for the province of Perm in Russia. Permian rocks are not
widespread in Western Europe but were identified when Murchison conducted a
survey of Russia.