The attractions of the Shimoda Port Geosite are the landscape and the culture of the town, which has for a long time been a major port of the area. The wide bay of the area is quite rare for Izu, and visitors can see the strata formed by submarine volcanoes.
Strata with distinctive beautiful striped pattern are waiting for the visitors in Kakizaki Bentenjima Island. These strata were formed by volcanic ash and pumice stone emitted by volcanic eruption of a submarine volcano accumulating on the ocean floor, and the striped pattern (cross lamina) is the effect of the ocean currents. On the surface of these strata, one can observe the so-called 'trace fossils' (fossils with marks left by shellfish and other living things, for example the holes they dug out or the paths they left as they crawled on the bottom of the sea).