1. Department of Archaeology, Institute of History CSIC – Spanish National Research Council, Albasanz, 26–28 28037 Madrid Spain
2. Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing 100044 China
3. CAS Center for Excellence in Life and Paleoenvironment Beijing 100044 China
4. Hebei Provincial Institute of Cultural Relics Shijiazhuang 050033 China
5. Institute of Archaeology University College London 31–34, Gordon Square WC1H 0PY London United Kingdom
6. School of Humanities University of Chinese Academy of Sciences Beijing 100049 China