The mystery of the cliff that "lays eggs", where Sun Wukong was born?
In a remote mountainous area of Guizhou province, China, there is a mysterious geological wonder. Locals say that every 30 years a stone egg "gives birth" to a person.
Báo Khoa học và Đời sống•10/06/2025
The story of Sun Wukong, the legendary character in the novel "Journey to the West", being born from a rock has become familiar. However, few people know that in a deep mountainous area of the Qiannan Buyei and Miao Autonomous Prefecture, Guizhou Province, China, there is a real geological phenomenon that is no less strange. According to IFL Science, there is a cliff here called "egg-laying cliff" by local residents. What is special about this cliff is that it is said that every 30 years, round "stone eggs" will gradually separate from the rock surface.
These stone eggs are not small, they range in diameter from 20 to 40 cm, and have a round and smooth appearance. In the scientific community, they are called by the term "cannonball concretions" due to their characteristic shape that resembles ancient cannonballs. To the locals, they are like giant eggs born from Mother Earth herself. They also speculate that these stone eggs are related to the legend of the spirit stone, which will produce spiritual creatures that converge the essence of heaven and earth like the Great Sage Equaling Heaven, Sun Wukong. Scientists have studied and decoded some of how these "stone eggs" were created. They are not eggs in the biological sense, but the product of a geological process spanning millions of years, involving the interaction of water, minerals and sediments. The process begins when mineral-rich water slowly seeps into cracks and pores in the rock. In its path, the water encounters a “seed point,” which could be a tiny fossil, a piece of organic matter, or even just another mineral that’s already there.
With this nucleus as the center, water-soluble minerals and small sediment particles will slowly adhere and accumulate around it, forming layers. Just like how pearls form in oysters, these layers of material continue to thicken over time, enveloping the original nucleus. Over countless centuries, this accumulation process is slow but persistent, eventually forming solid, round or nearly round-shaped rocks. One of the most mysterious aspects of this cliff is the periodic appearance observed and recorded by locals, approximately every 30 years. These concretions are formed deep within the rock structure. They only appear on the surface after the surrounding softer rock is gradually eroded by the effects of weather, wind, rain, and currents. However, scientists have yet to come up with a unified explanation for why the erosion and "egg-laying" process seems to follow a relatively regular cycle of about 30 years.
Current hypotheses focus on the connection between this phenomenon and the unique geological structure of Guizhou province, which is rich in limestone. Along with that is the region's characteristic humid monsoon climate. It is possible that the combination of water-soluble rock and climate factors creates a rate of erosion or a geological mechanism that leads to this particular occurrence cycle. According to geologists who conducted direct surveys in the area, these "stone eggs" are the product of geological movements and weathering processes that took place on a geological scale. They estimate that these rocks were formed about 500 million years ago, during the Cambrian period - a very ancient period in Earth's history. The "egg-laying" cliff in Guizhou remains a unique geological wonder and an interesting puzzle for science, demonstrating the complex and miraculous phenomena that nature still hides.
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