![](https://www.oki-geopark.jp/wp/wp-content/uploads/2023/03/quartz-syenite-n-hornfels-oyama-900-1.jpg)
Geohistory - Rocks from Volcanic Islands Period
Geosites / Nishinoshima Town
This rock was formed by magmatic activity underground around 7 million years ago, right before volcanic activity began in the Dōzen Islands. Around it you can also see rocks that were scorched by the magma's heat.