1. Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing China
2. Chinese Academy of Sciences Center for Excellence in Life and Paleoenvironment Beijing China
3. Institute of Global Environmental Change Xi'an Jiaotong University Xi'an China
4. State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment, Chinese Academy of Sciences Xi'an China
5. Chinese Academy of Sciences Center for Excellence in Quaternary Science and Global Change Chinese Academy of Sciences Xi'an China
6. Department of Anthropology Washington University Saint Louis Missouri USA