WAN Xiaoqiao ),LI Gang ),CHEN Piji ),YU Tao ),YE Dequan ) ) China University of Geosciences, Beijing,) Institute of Geology, Paleontology, Nanjing, ) Exploration, Development Research Institute of Daqing Oilfield Compoany.2005. Isotope Stratigraphy of the Cretaceous Qingshankou Formation in Songliao Basin and Its Correlation with Marine Cenomanian Stage[J]. Acta Geologica Sinica,79(2):150-156
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