The Central Siberian Plateau is an ancient craton (sometimes named Angaraland) that formed an independent continent before the Permian (see the Siberian continent). It is exceptionally rich in minerals, containing large deposits of gold, diamonds, and ores of manganese, lead, zinc, nickel, cobalt and molybdenum. Much of the area includes the Siberian Traps—a large igneous province. This massive eruptive period was approximately coincident with the Permian–Triassic extinction event. The volcanic event is said to be the largest known volcanic eruption in Earth's history. Only the extreme northwest was glaciated during the Quaternary, but almost all is under exceptionally deep permafrost, and the only tree that can thrive, despite the warm summers, is the deciduous Siberian Larch (Larix sibirica) with its very shallow roots. Outside the extreme northwest, the taiga is dominant, covering a significant fraction of the entirety of Siberia. Soils here are mainly turbels, giving way to spodosols where the active layer becomes thicker and the ice content lower.
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