1. Department of Earth and Planetary Sciences, University of California–Davis, Davis, California 95616, USA
2. Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China
3. CAS Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
4. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China