Citation: | LIU Yongqing, PANG Qiqing, LI Peixian, TIAN Shugang, NIU Shaowu. 2002: Advances in the study of non-marine Jurassic-Cretaceous biostratigraphi cal boundary and candidate stratotype in Luanping basin,northern Hebei. Geological Bulletin of China, 21(3): 176-180. DOI: 10.12097/gbc.20020339 |