The Caucasian features of the "Beauty of Xiaohe" raised the prospect that the region's inhabitants were European settlers.
It raises the question about who first settled in Xinjiang and for how long the oil-rich region has been part of China. The questions are important – most notably for the Chinese authorities who face an intermittent separatist movement of nationalist Uighurs, a Turkic-speaking Muslim people who number nine million in Xinjiang.
The government-approved story of China's first contact with the West dates back to 200BC when China's emperor Wu Di wanted to establish an alliance with the West against the marauding Huns, then based in Mongolia. However, the discovery of the mummies suggests that Caucasians were settled in a part of China thousands of years before Wu Di: the notion that they arrived in Xinjiang before the first East Asians is truly explosive.