A 300-million-year-old forest buried under volcanic ash in China offers rare insights into ancient plants and climate, akin to Pompeii for the plant world.
Ancient forest found under volcanic ash
Scientists from China and the United States have discovered a forest preserved under volcanic ash that is 300 million years old. The site could offer valuable insights into the types of plants and the climate that existed at the start of the Permian period, a time when life on Earth was undergoing significant changes.A natural Pompeii of plants
Some of the trees in the forest still have their leaves intact, making it akin to the ancient Roman city of Pompeii, where volcanic ash preserved the city's structures and people. This discovery provides a rare glimpse into the plant life of a distant geological era.The Xiaozhai Tiankeng cave system
The Xiaozhai Tiankeng, located in Fengjie county near Chongqing, is a massive cave system known as a "celestial well" in Chinese. It measures about 626 meters in length, 537 meters in width, and has a depth ranging from 511 to 662 meters, making it one of the largest known sinkholes in the world.Formation through natural erosion
The Xiaozhai Tiankeng began forming around 128,000 years ago through a process common in karst landscapes. Rainwater, slightly acidic from carbon dioxide in the atmosphere and soil, eroded the limestone over time, eventually causing the ceiling to collapse and creating the massive cavity.Unique ecosystem at the bottom
At the bottom of the cave, a subtropical forest has thrived for thousands of years, supported by the unique conditions created by the vertical walls. These include high humidity, cool temperatures, and limited sunlight. Over 1,200 plant species, including ancient ginkgos, have been recorded in this isolated environment.New sinkholes in China's rainforests
A network of deep sinkholes has recently been discovered in China's tropical rainforests. These caves are expected to provide important information about biodiversity, as they are home to a wide range of plant and animal species, some of which may not yet be scientifically described.Clouded leopards and ecological connections
The Xiaozhai Tiankeng is also home to the clouded leopard, a vulnerable species that lives in trees. Its presence indicates that the cave is not entirely isolated from the surrounding environment, suggesting that an ecological corridor connects the cave to the nearby forests.Guided tours and conservation challenges
Local authorities now allow guided tours of the cave, with a staircase built along the walls to help visitors reach the bottom. However, the site remains sensitive, as even small disturbances can disrupt the delicate balance of its ecosystem, which has developed over tens of thousands of years of isolation.Balancing exploration and preservation
The challenge at Xiaozhai Tiankeng is to allow scientific study and public access while preserving the unique environment that makes it rare. This involves careful management to ensure that exploration does not erase the very features that make the site so valuable to scientists and nature lovers.
