Key Laboratory of Western Mineral Resources and Geological Engineering of the Ministry of Education School of Earth Science and Resources Chang 'an University Xi'an 710054 China;
State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeobiology Chinese Academy of Sciences Nanjing 210008 China;
Changqing Oilfield Company Petrochina Xi'an 710018 China;
Early Life Evolution Laboratory School of Earth Sciences and Resources China University of Geosciences Beijing 100083 China;