1. CAS Key Laboratory of Economic Stratigraphy and Palaeogeography; Nanjing Institute of Geology and Palaeontology; Chinese Academy of Sciences; No. 39 East Beijing Road Nanjing 210008 China
2. University of Chinese Academy of Sciences; No. 19 A Yuquan Road Beijing 100049 China
3. Xi'an Center of Geological Survey; 438 the East of Youyi Road Xi'an 710054 China
4. Institute of Karst Geology; CGS; No. 50 Qixing Road Guilin 541004 China
5. State Key Laboratory of Palaeobiology and Stratigraphy; Nanjing Institute of Geology and Palaeontology; Chinese Academy of Sciences; No. 39 East Beijing Road Nanjing 210008 China