Discussion on Chemo-Stratigraphic Characteristics of Boundary Bed between the Top Part of the Ordovician and the Basal Part of the Silurian at Dawangou Section, Keping, Xinjiang
PI Xuejun,LIU Chuxiong,CHEN Ying,SUN Zuoyu,HAO Weicheng
Acta Scientiarum Naturalium Universitatis Pekinensis . 2007, (2): 183 -189 . 

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