In December 1929, a Chinese paleoanthropologist named Pei Wenzhong discovered a complete skull of 'Peking Man' on Dragon Bone Hill northwest of Zhoukoudian, in the southwest suburbs of Beijing. The discovery pushed the history of Beijing's civilization back to some 600,000 years. These fossilized remains prove that 'Peking Man' was primitive man in an evolutionary process from ancient ape to modern man, and is the ancestor of the Chinese nation.[China.org.cn]