crustose

crustose

1. crustose lichen

壳状地衣

2. 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。