Storm dominated ramp system.
Mounds composed of stromatolites, microbial laminites, oncolites, cyanobacteria (Epiphyton, Girvanella etc.), crinoids, bryozoans.
Up to 3 m thickness, 0.5 m to 6 m across.
Thrombolitic buildups in Gushan Formation.
Stromatolitc buildups in Changshan Formation.