Significance of First Appearance Datum of Cyprideis for Division of Shangyoushashan and Xiayoushas han Formations in Qaidam Bas in
Zhang Haiquan, Sun Zhencheng, Jing Minchang, Lu Yanli, Dong Ning, Yuan Xiujun and Cao Li
China Petroleum Exploration . 2006, (6): 104 -112,131 . 

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