1. School of Earth Sciences & Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou University, Lanzhou 730000, PR China
2. Key Laboratory of Vertebrate Evolution and Human Origin of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, PR China
3. Yunnan Key Laboratory for Palaeobiology, Institute of Palaeontology, Yunnan University, Yunnan Province, Kunming 650000, PR China
4. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences/Key Laboratory of Petroleum Resources, Gansu Province, Lanzhou 730000, PR China