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What are the rock paintings of Helan Mountain in Ningxia?

Helan Mountain is 250 kilometers long and runs from north to south. Rock paintings are mainly human faces, mainly round and crown-shaped faces, but there are also a few sun-shaped and square faces. The production method mainly adopts grinding and engraving method, made of stone tools, and a small amount adopts knocking and grinding method. In addition to face rock paintings, there are animal images such as sheep, tigers and deer, among which the image of tiger is the most and the most exquisite.

Rock paintings of Helan Mountain