1. School of Archaeology and Museology, Peking University, Beijing, People’s Republic of China
2. Department of Geology and Geological Museum, Peking University, Beijing, People’s Republic of China
3. School of History, Beijing Normal University, Beijing, People’s Republic of China
4. School of Earth and Space Sciences, Peking University, Beijing, People’s Republic of China
5. Department of Earth and Planetary Sciences, University of California, Davis, CA, USA
6. University of Alaska Museum, Fairbanks, AK, USA
7. Department of Geosciences, University of Alaska Fairbanks, Fairbanks, AK, USA
8. Department of Earth Sciences, University of Milan, Milan, Italy
9. Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, USA
10. Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, TN, USA