1. Department of Geology, State Key Laboratory of Continental Dynamics Institute of Cenozoic Geology and Environment Northwest University Xi'an China
2. Geophysics, Department of Physics University of Alberta Edmonton AB Canada
3. Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing China
4. State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an China
5. CAS Center for Excellence in Quaternary Science and Global Chinese Academy of Sciences Xi'an China