Late Permian period Wu Jia Ping magnesium limestone reef in the Western European Commission, represented the basin reefs, these types of simple reef, or from stromatolites bryozoans composition.

• 晚二叠世吴家坪期的礁以西欧镁灰岩统盆地的礁为代表，这些礁的类型简单，由叠层石或苔藓虫组成。