Internal-wave and internal-tide deposits of the Middle Ordovician Xiangshan Group Xujiajuan Formation， Ningxia
Li Xiangdong, He Youbin, Wang Dan, Gao Zhenzhong, Zheng Zhaochang
JOURNAL OF PALAEOGEOGRAPHY . 2009, (5): 513 -523 .  DOI: 10.7605/gdlxb.2009.05.005