Laboratory for Earth Surface Process;
Ministry of Education;
College of Urban and Environmental Sciences;
Peking University;
Beijing 100871;
China;
Shaanxi Provincial Institute of Archaeology;
Xi'an 710054;
China;
College of Archaeology and Museology;
Peking University;
Beijing 100871;
China;
Xinjiang Cultural Relics and Archaeology Institute;
Urumqi 830000;
China;
School of Anthropology;
Washington University in St. Louis;
C.B. 1114;
St. Louis;
MO 63130;
USA;