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.