地壳抬升，岩体节理裂隙发育。在风化、溶蚀等外力作用下，岩块崩落。该岩块位于光岩穿洞出口水潭中，枯水期时露出水面，远远望去，形似出水捕食的鳄鱼，故而得名“鳄鱼石”。

The joints and fissures in the rocks were developed resulted by crustal uplift. Under the effect of exogenic processes like weathering and erosion, the rock mass collapsed. The rock block is located at the outlet of Guangyan light-through cavity and exposed to the water surface in the dry season. It looks like a crocodile that preys on the water, hence the name “crocodile stone”.