1. Resource and Environmental Engineering College, Guizhou University, Huanx 550025, Guiyang, Guizhou, China (e-mail: gzyuewang@126.com)
2. Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Street 100037, Beijing, China
3. College of Paleontology, Shenyang Normal Univeristy, 253 Huanhe N Street 110034, Shengyang, Liaoning, China