What folding lies at the base of Southern Siberia?

So, it is worth knowing that the Altai-Sayan region of Paleozoic folding lies here. That is how it is correctly called. In fact, this is a complex combination of pre-Baikal massifs. It is also worth knowing that in the south, this folding goes beyond the borders of the Russian Federation, to Mongolia. It is also worth knowing that this folding is one of the largest in Eurasia. It stretches almost all the way to Lake Baikal.