1. Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia.
2. Nanjing Institute of Geology and Paleontology, Nanjing, China.
3. Department of Geology, University of Maryland, College Park, Maryland.
4. State Key Laboratory of Palaeontology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China.
5. Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana.