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＜departmental bulletin paper＞
The former shoreline heights of the last interglacial time and the Holocene time in the Yukuhashi plain, North Kyushu, Japan.
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| Abstract | In this study, the authors clarified the height of shorelines of the Shimosueyoshi and the Jomon ages by means of field work on land and of boring data subsurface in the Yukuhashi area. The results ob...tained are as follows. 1. Coastal terraces, previously considered as marine terraces of the last interglacial time, are covered with the Aso-4 tephra deposits and consist of the eolian sand and fluvial deposits, which are exposed down to 3.8m above the present sea-level. Thus, the last interglacial shoreline is estimated at lower than 3.8m above the present sea-level. 2. Beneath the Yukuhashi plain, two marine layers containing marine shells were found in the core samples. The upper one is of the Jomon transgression age, because the Akahoya tephra was found at the base. The lower one is of the Shimosueyoshi transgression age because the layer lay beneath the Aso-4 tephra. 3. The maximum height of the Shimosueyoshi layer is 10m below the present sea-level according to the boring data examined. Thus, the Shimosueyoshi shoreline height is inferred to be between + 3.8m (from on-land data) and -lOm (from boring data). 4. The highest level of the Jomon transgression layer found beneath the plain is + 1.6m above the present sea-level. This is similar in height to that on the Genkainada coast, and is lower than the average on the coast of the Japanese Islands. 5. Thus, it is concluded that the Yukuhashi plain has been a subsiding area as well as the Genkai district at least since the Shimosueyoshi age in the late Quaternary.show more |
| Table of Contents | I. はじめに II. 調査地域及び研究史 III．調査方法 IV. 行橋平野の地形と地質 V. 考察 |
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| Created Date | 2021.10.18 |
| Modified Date | 2022.06.20 |