Four conodont assemblage zones and one bed have been recognized in ascending order: 1. Pachycladina obliqua-Parachirognathus delicatulus Zone, 2. Neospatho-dus homeri-Neospathodus triangularis Zone, 3. Neogondolella cf.

• 在永宁镇组中识别出4个牙形石组合带(层)(由下而上):1.；Pachycladina obliqua-Parachirognathus delicatulus带；2