Geosite List Home Geosite Utsugi-ishi Quarry Ruins Utsugi-ishi Quarry Ruins This is the ruins of a quarry for Utsugi-ishi (rhyolitic tuff) which had been used for stonewalls for its easiness of processing. The rocks had been used for the Kashinozaki-todai and Shinomisaki-todai Lighthouses. Map Utsugi-ishi Quarry Ruins 33.538229,135.8038902,14 See in the map app