Siberian Platform or Angara Shield, large, geologically stable area of Precambrian rocks, N Asia, comprising much of Siberia, Russia. It is bounded, in general, on the west by the Yenisei River, on the east by the Lena River, on the north by the Arctic Ocean, and on the south by the general latitude of Lake Baykal. Most of the region is covered by strata of lower Paleozoic sediments and it is thought that since the early Paleozoic era it has remained above the level of invading seas that flooded most continental land masses. Tundra and taiga cover the region, which also has a rich variety of minerals.
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