1. School of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
2. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, CAS, Nanjing 210008, China
3. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
4. School of Earth Sciences, University of Bristol, Bristol BS1 5QD, UK