• GUO Caiqing1, YAO Jianxin1, WU Pengcheng2 and LI Chengsen2, *

  GUO Caiqing1, YAO Jianxin1, WU Pengcheng2 and LI Chengsen2, *

  1 Key Laboratory of Stratigraphy and Paleontology, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2 State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
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This study was supported by grants from China Geological Survey (No. 1212011120116), the Natural Science Foundation of China (Nos. 41072022 and 41210001), the International S & T Cooperation Project of China (No. 2009DFA32210), and the Outlay Research Fund of the Institute of Geology, Chinese Academy of Geological Sciences (No. J1213). This paper also represents a contribution to a bilateral research project supported by the Chinese Ministry of Science and Technology and the Belgian Federal Science Policy Office (BL/36/C54).