1. Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Box 643, Beijing 100044, China.
2. Human Origins Program, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560–0112, USA.
3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Box 9825, Beijing 100029, China.
4. Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, USA.
5. Natural History Museum of Guangxi Zhuang Autonomous Region, Nanning 530012, China.
6. History Museum of Guangxi Zhuang Autonomous Region, Nanning 530022, China.