Between the ridge that connects the Shimoyachi district and the Utsusawa district, there is an area where the strata are exposed. Burrows of creatures living in the shallow seas and fallen objects from the eruption of volcanoes can be found in these strata, proving that various environmental changes had occurred in this location in the past. By looking at these old strata it is possible to directly interact with memories of the land from a time before mankind. long period of time. By repetition of sandstone and mudstone sedimentation, a stratiform formation was made.