The oolite beach of the lower Triassic Feixianguan Formation in eastern Sichuan basin developed in themargin of carbonate platform, and platform margins are always related to ocean trough.

• 四川盆地东部下三叠统飞仙关组鲕滩主要发育在碳酸盐岩台缘带上,而台缘带与海槽密切相关,找到了海槽就意味着找到了鲕滩。