Chichibu Geopark

Basic points

You can see the stratum from the time when Paleo Chichibu Bay, which existed about 17 million to 15 million years ago, was still a deep sea. A dynamic stratum is exposed over a width of approximately 800m, showing proof to the present that this location was submerged in the deep sea in the past. It is designated as a national natural monument.

You can observe a twisted stratum that was formed through landslides at the bottom of the sea (folds), a time difference between strata (discordance), and a stratum created over a long period of time on the sea bed through sand and mud (turbidite) that has a distinct striped pattern.