supported by the National N atural Science Foundation of China(Grant No.40472003);the Ministry of Science and Technology of China(Grant Nos.G2000077701 and 2003CB7 16805);the Chinese Academy of Sciences(Grant No,KZCX3-SW-141).
Abundant and well-preserved organic-walled microfossils including acanthomorphic acritarchs have been found in Mesoproterozoic Beidajian Formation in the Yongji area of Shanxi Province, North China. The morphological ...