![](https://www.oki-geopark.jp/wp/wp-content/uploads/2023/03/Quarry-Site-Koji-900-1.jpg)
Geohistory - Rocks from Continental to Sea Periods
Geosites / Okinoshima Town
Here you can observe rock layers formed around 20 million years ago, when the land of Oki was at the bottom of a lake.
Called "Goka-ishi," the rocks here are easy to process and were used for purposes such as paving stones.