The speleology at the Fun Fun Cave records the following formations:
- Stalactites: these are suspended formations of the roof originated by the process of dissolution of the limestone rocks by runoff water. The dissolved carbonates crystallize when making contact with the air that circulates inside the cavern, giving rise to calcite or crystallized limestone.
- Stalagmites: formations originated by the crystallization of the carbonates that fall dissolved with the water droplets from the stalactites. Its formation begins in the floor of the caverns, ascending until being united with the stalactites to form a column, in a union known as the "eternal kiss".
- Flowstones: the phenomenon of solidification resulting from the dissolution of limestone when water penetrates through existing fissures in the rock walls. They can have the shape of ridges and other types of speleological phenomena.
- Daylight holes: formation of holes in the roof of the cavern due to dissolving minerals, allowing the penetration of light into the interior.
- Columns: it is when nature, through the speleological process, demonstrates a perfect symmetry, by joining a stalactite with a stalagmite.
- Calcite: is the rock that is formed by the crystallization of carbonates. When the crystals receive the reflection of light, a phosphorescence glitter is observed, the glitter characteristic of gold itself.