Reef limestone and reef dolomite: Only developed 
in the Changxing Formation, the reef building organisms  are mainly sponges, while foraminiferas, brachiopods, and  other accessory organisms can also be seen. The content of sponges in the framework reef limestone is the highest, and  some of the sponges have been dolomitized, meaning the sponge frameworks are filled with dolomite.

Coordinates estimated from map.