Late Quaternary Paleo-environments of Archaeological Sites in Japan and East Asia. Shorelines and Trend of Local Movements since the Peak of the Jomon Transgression in North Kyushu, West Japan.

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  • Shimoyama Shoichi
    Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University

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  • 東アジアと日本の遺跡をめぐる古環境　北部九州における縄文海進以降の海岸線と地盤変動傾向
  • ホクブ キュウシュウ ニ オケル ジョウモン カイシン イコウ ノ カイガンセ

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Abstract

Geological survey and investigation of coastal plains boring data were carried out at the Karatsu, Fukuoka, Koga-Tsuyazaki, Munakata, Ongagawa, Saga, and Chikugo plains in North Kyushu, West Japan. As a result, the most widespread distribution and the upper limit of the Holocene and late Pleistocene marine sediments were clarified.<br>The horizontal limit in the distribution of marine deposits can determine the shoreline at the peak of the Jomon transgression. At the Saga and Chikugo plains, the locations of the shoreline in the early Jomon, the end of Yayoi, and the early Edo periods were determined on the basis of horizontal limits of marine deposits, the sites of historical ruins, and the oldest known maps of the Saga and Chikugo areas.<br>The upper limits of the Holocene marine deposits in the coastal areas of the Genkai and Hibiki Seas, Japan Sea side of North Kyushu, varied from +0.4 to +4.5m in height. The upper limits at the peak of the Jomon transgression between the Saga and Chikugo plains, Ariake Bay side of North Kuyshu, are -1.9 and -4.8m. Therefore, the latest crustal movement in North Kyushu is complicated. Differences in the heights of the marine upper limits in these areas are due to the amounts of local vertical movement in the last 5, 000 or 6, 000 years.<br>The upper limits of the late Pleistocene marine deposits at the high stand of the Shimosueyoshi transgression at the Fukuoka, Koga-Tsuyazaki, Ongagawa, Yukuhashi, Saga and Chikugo plains are located far below the present sea level. This fact indicates that North Kyushu is a subsiding region on the whole.

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