1 Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China; Sino-Danish Center, University of the Chinese Academy of Sciences, Beijing 100049, China; University of the Chinese Academy of Sciences, Beijing 100049, China.
2 Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China.
3 Shaanxi Academy of Archaeology, Xi'an, Shaanxi 710054, China.
4 School of History and Culture, Shanxi University, Taiyuan, Shanxi 030006, China.
5 Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China; University of the Chinese Academy of Sciences, Beijing 100049, China. Electronic address: fuqiaomei@ivpp.ac.cn.