1:45 PM - 3:15 PM
[O08-P16] Study of a possibility of "Geosite Tatsu-no-kuchi" on the Sanriku Geopark.
Keywords:Earth Environment, Geology, Petrology, Fossils
The Sanriku Geopark stretches about 300 km from north to south along the Pacific coast from Aomori to Miyagi Prefectures. Hachinohe Fisheries Science Museum Marient, to which the Marient "Chikyu" Tanken Club Sr. belongs, is located at the northern end of the city (Figure 1).
The authors have been learning about the Sanriku Geopark as an activity to study their hometown since 2018. We have been focusing on the Taneichi Formation since 2020, researching and presenting on the geological and topographical features and the lives of the local people. The results have been presented at JpGU and the Japan Geopark National Convention. The Taneichi Formation is a distinctive sedimentary formation consisting of sandstone that formed about 85 million years ago during the Cretaceous Period along the northernmost coast of Honshu.
In 2022, we studied the site commonly known as "Tatsuｰno-kuchi" (Photo 1), located in Okonai, Hirono-twon, Iwate Prefecture. It is a small cape about 43 m long and 12 m high protruding from the sea cliffs. Its name comes from an old tale of a dragon's mouth opening in a day.
We will report here the results of our study on the suitability of Tatsuｰno-kuchi as a geosite and whether it can be registered.
At first, we studied the topographical change in an old tale. The study was conducted using three photographs taken in 1930, 2021, and an unknown year in the Showa period. So, we considered the shedding of nodule masses characteristic of the Taneichi Formation to be a major cause of the topographic change.
Next, we created a geo picture-story show and tourist pamphlet to confirm and share what we had learned and to make it widely known.
Based on the above, we discussed whether it is appropriate as a geosite for the Sanriku Geopark, in line with the Sanriku Geopark's founding purpose and basic policy. Discussion was held on the three factors that are highly qualified and three factors that are unqualified.
Finally, we concluded that it is unlikely to become a geosite at this time. But, The Taneichi Formations and Tatsuｰno-kuchi have great appeal, and we would like to continue our activities for geosite registration.
The authors have been learning about the Sanriku Geopark as an activity to study their hometown since 2018. We have been focusing on the Taneichi Formation since 2020, researching and presenting on the geological and topographical features and the lives of the local people. The results have been presented at JpGU and the Japan Geopark National Convention. The Taneichi Formation is a distinctive sedimentary formation consisting of sandstone that formed about 85 million years ago during the Cretaceous Period along the northernmost coast of Honshu.
In 2022, we studied the site commonly known as "Tatsuｰno-kuchi" (Photo 1), located in Okonai, Hirono-twon, Iwate Prefecture. It is a small cape about 43 m long and 12 m high protruding from the sea cliffs. Its name comes from an old tale of a dragon's mouth opening in a day.
We will report here the results of our study on the suitability of Tatsuｰno-kuchi as a geosite and whether it can be registered.
At first, we studied the topographical change in an old tale. The study was conducted using three photographs taken in 1930, 2021, and an unknown year in the Showa period. So, we considered the shedding of nodule masses characteristic of the Taneichi Formation to be a major cause of the topographic change.
Next, we created a geo picture-story show and tourist pamphlet to confirm and share what we had learned and to make it widely known.
Based on the above, we discussed whether it is appropriate as a geosite for the Sanriku Geopark, in line with the Sanriku Geopark's founding purpose and basic policy. Discussion was held on the three factors that are highly qualified and three factors that are unqualified.
Finally, we concluded that it is unlikely to become a geosite at this time. But, The Taneichi Formations and Tatsuｰno-kuchi have great appeal, and we would like to continue our activities for geosite registration.