1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, PR China
2. Earth Sciences, Negaunee Integrative Research Center, Field Museum of Natural History, Chicago, IL 60605, USA
3. Chicago Botanic Garden, Glencoe, IL 60022, USA
4. Department of Environmental Science, Policy and Management, University of California Berkeley, Berkeley, CA 94720, USA
5. Oak Spring Garden Foundation, Upperville, VA 20184, USA
6. Yale School of the Environment, Yale University, New Haven, CT 06511, USA