Every 30 years the cliff ‘lays’ egg-shaped rocks that locals believe bring good luck (Picture: AsiaWire)

Geologists believe they may have finally solved the mystery behind an odd cliff wall that appears to lay egg-shaped stones every 30 years.

Chan Dan Ya – Mandarin for ‘egg-producing cliff’ – is 19ft high and 65ft long.

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It has an uneven surface but every three decades it emits these odd-shaped rocks.

Residents in the nearby village Gulu have been scratching their heads over many years as they keep finding perfectly smooth rocks.

Natives of the village in Qiannan Buyei and Miao Autonomous Region in China’s south-western Guizhou Province have observed for years as the eggs ‘incubate’ in hollow overhangs on the cliff and eventually fall to the ground.

The egg cliff is growing in popularity with tourists being encouraged to go and have a look at it (Picture: AsiaWire)

Each hollow produces one egg every 30 years, villagers said, with those lucky enough to take one home believing that the oval rocks bring luck and fortune.

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It is perhaps part of the reason why only around 70 of them have been preserved to date – the others may have been sold or stolen.


Geological tests done on the region showed that it formed during the Cambrian period – about 500 million years ago.

However, the specific section of cliff, which is part of Mount Gandeng, is made of calcareous rock that is common in many regions on Earth.

The cliff formed during the Cambrian period around 500 million years ago (Picture: AsiaWire)

The difference in time it takes for each type of rock to erode has therefore been attributed to the appearance of the eggs, which comprise heavy sediment deposits, experts say.

However, that still does not explain how the rocks appear in smooth round shapes, or how a half-a-billion-year-old geological region managed to contain a calcareous rock formation.

In 2009, local tourism bureau director Yang Shengjia encouraged members of the public to visit Chan Dan Ya, saying that tourists would be ‘astonished’ to see the mountain that lays eggs.