1. School of Earth Sciences and Resources & Key Laboratory of Western Mineral Resources and Geological Engineering of the Ministry of Education, Chang᾽ an University, Xi’an, China
2. State key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China
3. Shaanxi Key Laboratory of Early Life and Environments, Northwest University, Xi’an, China
4. Geological Survey of Gansu Province, Gansu Geological Survey Institute, Lanzhou, China