About the Authors
- Hua Tu
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Affiliation College of Geographical Sciences, Nanjing Normal University, Nanjing, China
- Guanjun Shen
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* E-mail: gjshen@njnu.edu.cn
Affiliation College of Geographical Sciences, Nanjing Normal University, Nanjing, China
- Haixu Li
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Affiliations College of Geographical Sciences, Nanjing Normal University, Nanjing, China, Department of Natural Science, Zhangjiakou University, Zhangjiakou, China
- Fei Xie
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Affiliation Hebei Provincial Institute of Cultural Relics, Shijiazhuang, China
- Darryl E. Granger
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Affiliation Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, Indiana, United States of America
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: GJS DEG FX. Performed the experiments: HT HXL GJS DEG. Analyzed the data: GJS DEG HT. Contributed reagents/materials/analysis tools: FX HXL. Wrote the paper: HT GJS DEG.