![](https://www.oki-geopark.jp/wp/wp-content/uploads/2023/03/ichnofossils-shimazushima-island-900-1.jpg)
Geohistory - Rocks from Volcanic Islands Period
Geosites / Chibu Village
Here you can see fossilized burrows, the homes of creatures who dug holes in the sand at the bottom of the sea long ago. Around 6 million years ago, when the Dōzen Islands were in their volcanic islands period, this area is thought to have been at the bottom of the shallow sea around Dōzen.