The trees found at the site are identified as Sugi (Japanese cedar) and reach diameters of up to two meters.
The preservation was caused by a debris flow from Mount Sanbe that trapped the forest in a low-oxygen, high-ash environment.
The site remains largely as it was found, with the trees kept in their original upright growth position.
The exhibit includes a full-scale reconstruction of how the forest appeared before the volcanic event.
Researchers use the rings of these ancient trees to study climate data from the mid-Jomon period.
The Sanbe Jomon Forest Museum, known as the Azukihara Jomon Forest, preserves a unique archaeological site where ancient Japanese cedar trees were buried standing in place by a massive volcanic eruption approximately 4,000 years ago. Visitors can observe these colossal stumps in situ within their original volcanic ash and soil layers, providing a rare cross-section of a Jomon-period landscape. The museum features an elevated walkway surrounding the excavated fossil forest, allowing for a 360-degree view of the vertical remains. The facility was constructed specifically to protect these organic artifacts from degradation after their 1983 discovery during land development. The site offers insight into the geological impact of the Sanbe volcano on prehistoric human settlements. Educational displays clarify how the rapid burial preserved organic matter that would typically decay in the acidic soil of the region.
From the highest point of the elevated viewing platform looking down into the excavated central crater.
Bring a light jacket as the underground preservation area remains cool throughout the year.
Spend time reading the geological diagrams provided along the walkway to understand the volcanic layering process.
Check the official website for current temporary closure notices before traveling to this rural area.
Do not attempt to access the lower pit level, as it is restricted to preserve the archaeological integrity of the site.
Generally closed on Wednesdays; if a public holiday falls on a Wednesday, it is usually closed the following day.
Refrain from touching the fossilized wood and stay strictly on the designated viewing platforms.
