![](https://www.oki-geopark.jp/wp/wp-content/uploads/2023/03/Obsidian-and-Volcanic-Vent-Kishihama-900-1.jpg)
Geohistory - Rocks from Volcanic Islands Period
Geosites / Okinoshima Town
At Kishihama-tōge Pass, the path through which magma traveled was buried by pyroclastic rock, and inside it are volcanic glasses formed by the rapid cooling of magma: obsidian, perlite, and pitchstone.