1. CAS Key Laboratory of Economic Stratigraphy & Palaeogeography; Nanjing Institute of Geology & Palaeontology; Chinese Academy of Sciences; Nanjing 210008 China
2. Center for Excellence in Life & Paleoenvironment; Chinese Academy of Sciences; Nanjing 210008 China
3. Department of Geological Sciences; University of Manitoba; Winnipeg Manitoba R3T 2N2 Canada
4. Department of Earth & Environmental Sciences; Andong National University; Andong 36729 Korea