Mass-occurrence of oncoids in the Early-Middle Cambrian transition at western margin of North China Platform：A response of microbial community to shallow marine anoxia
Zhang Wenhao, Shi Xiaoying, Tang Dongjie, Wang Xinqiang
JOPC . 2014, (3): 305 -318 .  DOI: 10.7605/gdlxb.2014.03.027