中文摘要：

四川江油渔洞子剖面上二叠统长兴组顶部出现的群体珊瑚Waagenophyllum sp.是我国所发现的最晚的古生代群体四射珊瑚之一,下三叠统飞仙关组底部微生物岩直接覆盖在它上面,二叠系-三叠系界线成为这两种不同的生物沉积的分界线,它们各自具有一个独特而复杂的生态系统,二者之间为突变关系。在珊瑚层生态系统中的群体四射珊瑚及重要成员真核藻类如裸海松藻、假蠕孔藻等在微生物岩生态系统中完全消失,后者以底栖微生物群落为主,共生生物组合面貌与珊瑚层中的生物组合面貌截然不同,微生物岩生态系的生物个体小型化也是主要变化之一。

英文摘要：

The latest Paleozoic colonial coral Waagenophylium sp. occurs near the top of the Upper Permian Changxing Formation in the Yudongzi Section of Jiangyou, Sichuan. It is directly covered by the Early Triassic microbialite near the bottom of the Feixianguan Formation. The boundary between the Permian and Triassic is also the boundary between the two organic deposits that respectively has specific and complex ecosystems. A sharp change takes place from the coral stratum ecosystem to the microbialite ecosystem. Colonial coral in the former is taken over by benthic microbial assemblage in the latter. Eukaryotic algae such as Gymnocodium, Pseudovermiporella etc. totally disappear in the microbialite ecosystem. The size of biota in the microbialite ecosystem is much smaller than that in the coral stratum ecosystem.