1. Institute of Geology and Paleontology Linyi University Linyi276000China
2. Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing210008China
3. Department of Geological Sciences University of Missouri Columbia Missouri65211USA
4. X‐ray Microanalysis Core University of Missouri Columbia Missouri65211USA
5. Shanxi Key Laboratory of Early Life and Environment State Key Laboratory of Continental Dynamics and Department of Geology Northwest University Xi'an710069China