Evidence of emergence including sabkha dolostone, algal mat, bird-eyes and fenestral structure, mudcracks and crustose limonite has been found in the top of the Changhsingian reefs in Ziyun, Guizhou province.

 
  • 贵州紫云长兴期生物礁顶部存在的出露证据有:(1)形成于萨勃哈蒸发环境的白云岩,(2)藻纹层沉积,(3)鸟眼和窗格构造,(4)干裂缝和褐铁矿风化壳,等等。
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