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＜departmental bulletin paper＞
Quaternary geology of the low-land along the north coast of Ariake Bay, West Japan
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| Abstract | Geological survey on the land surface, examination of many boring data, analysis of tephras and molluscan fossils in the Quaternary deposits in the low-land along the north coast of Ariake Bay were ca...rried out. The sedimentary environments of the Quaternary, the relationship between geological events (deposition of pyroclastic flow and changes of sea-level) and older landform of the low-land during the past several thousands years were discussed and the followings became clear. 1. The Pleistocene deposits of the area can be redivided into the Ushiya Member, the Kawazoe Member (the Tateishi Member), the Nakabaru Member, the Takagise Member, the Aso-4 phyroclastic flow deposits and the Mitagawa Member. The Holocene deposits are divided into the Hasuike Member, the Ariake Clay Member and the artificially reclaimed soil. Among them the Takagise Member and the Ariake Clay Member are of marine origin and contain many molluscan fossils. 2. The tephrostratigraphical study indicates that the Aso-3 pyroclastic flow deposits were found below the most widely marine deposit, which is probably of the Shimosueyoshi transgression. 3. There are two kinds of alluvial clays in the sequence. The one is the upper clay of the Hasuike Member and another is the Ariake Clay Member. The former was formed in the estuary marsh, and the latter in the old Ariake Bay. 4. Marine limit at the time of the maximum Jomon transgression and the extent of the past estuary marsh were shown on a map. 5. There are differences in the height of the upper limit of the Jomon marine deposits among the Shiroishi, Saga and Chikugo areas. The height is especially low in the Saga area. It may possibly indicate either the crustal subsidence since the maximum Jomon transgression or difference in depositional environment.show more |
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| Created Date | 2021.10.18 |
| Modified Date | 2022.06.20 |