Limestone spires occasionally crack open to reveal Permian fossils. Paleontologists systematically catalog each exposed surface to reconstruct an ancient reef ecosystem.
CEphoto, Uwe Aranas, CC BY-SA 3.0
An ocean frozen in stone
The towering limestone pillars of the Shilin Stone Forest look like a landscape from another world, but they are actually the remnants of our own. About 270 million years ago, during the Permian period, this entire region was a warm, shallow sea. For millions of years, the skeletal remains of marine organisms accumulated on the seabed, forming a thick layer of carbonate mud. This sediment eventually became the massive limestone beds of the Qixia and Maokou Formations seen today.
After the sea retreated, immense geological pressure caused the land to rise. This newly exposed limestone plateau became subject to erosion. Rainwater, made slightly acidic by carbon dioxide from the atmosphere, seeped into cracks in the rock, slowly dissolving the limestone and carving the deep, narrow fissures that define the forest. This process, which continues today, has sculpted the rock into a dense collection of pillars, some reaching over 40 meters in height. The stone spires are a example of karst topography, a landscape shaped by the dissolution of soluble rock.
A catalog of ancient life
The stone pillars are geological curiosities; they are a record of ancient life. The limestone is exceptionally full of marine fossils from the Permian period. As the rock weathers and breaks apart, it exposes the preserved forms of creatures that died 270 million years ago. Some rock layers are composed almost entirely of biological debris.
The fossilized ecosystem includes a diverse community of organisms. Scientists have identified reef-building lifeforms like corals and sponges, as well as brachiopods, gastropods, cephalopods, and bryozoans. Also common are fusulinids, a type of single-celled organism that built shells resembling grains of rice. By mapping the location of these fossils on the surfaces of the pillars, paleontologists can reconstruct the structure of the ancient reef. This work provides a detailed record of a marine world that existed long before the dinosaurs, just prior to the largest mass extinction event in Earth's history, the Permian-Triassic extinction, which eliminated over 90% of all marine species.
💡Fun Facts
The Stone Forest is a UNESCO World Heritage site, recognized for its unique karst formations and geological history.
Some of the tallest stone pillars in the park are as high as a 10-story building.
The local Sani people, a branch of the Yi ethnic group, have lived in the region for over 2,000 years and have many legends about the forest's creation.
The fossils preserved here predate the "Great Dying," the Permian-Triassic extinction event that occurred around 252 million years ago.
7:30 AM – 6:00 PM (March to October); 8:00 AM – 5:30 PM (November to February).
Admission
¥130 for adults. An optional shuttle bus ticket inside the park costs an additional ¥25.
Accessibility
The main areas have paved, flat walking paths suitable for most visitors, but exploring the denser sections involves uneven stone steps and narrow passages.
