https://chigakusha.com/volcanic-ash-layers-and-a-sea-cave-on-the-arasaki-coast-miura-peninsula-yokosuka-shi-kanagawa-2021-2/
Volcanic ash layers and a sea cave on the Arasaki Coast, Miura Peninsula, Yokosuka-shi, Kanagawa,...
Volcanic ash layers and a sea cave on the Arasaki Coast, Miura Peninsula, Yokosuka-shi, Kanagawa, 2021 by Katsuaki Watanabe三浦半島荒崎海岸の火山灰層と海食洞（神奈川県横須賀市）
volcanic ashsea caveon themiura peninsulalayers