Petroglyphs in Russia. Lower Amur River (border between Siberian Russian and Inner Manchuria in China)  at Sakachi-Alyan. Some petroglyphs date back to 12000 BCE. The tribes settling along the Amur produced the human-like mask and a “skeleton” style – both reflecting a type of shamanism. There are about half a million of petroglyphs known in Siberia and the Far East of Russia. (rw)