About the Authors

Jianping Zhang

jpzhang@mail.iggcas.ac.cn

Affiliation Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China

Houyuan Lu

Affiliation Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China

Wanfa Gu

Affiliation Zhengzhou Provincial Cultural Relics and Archaeology Research Institute, Zhengzhou, China

Naiqin Wu

Affiliation Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China

Kunshu Zhou

Affiliation Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China

Yayi Hu

Affiliation Zhengzhou Provincial Cultural Relics and Archaeology Research Institute, Zhengzhou, China

Yingjun Xin

Affiliation Zhengzhou Provincial Cultural Relics and Archaeology Research Institute, Zhengzhou, China

Can Wang

Affiliations Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, University of Chinese Academy of Sciences, Beijing, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JZ HL. Performed the experiments: JZ HL CW. Analyzed the data: JZ HL NW KZ. Contributed reagents/materials/analysis tools: WG KZ YH YX. Wrote the paper: JZ HL NW.