@article{oai:rekihaku.repo.nii.ac.jp:00000268,
 author = {藤尾,  慎一郎 and Fujio,  Shin'ichiro},
 journal = {国立歴史民俗博物館研究報告, Bulletin of the National Museum of Japanese History},
 month = {Mar},
 note = {application/pdf, 本稿は，「弥生時代の実年代」（雄山閣）［藤尾2009b］の発表後に行った，いわゆる2400年問題の時期に相当する弥生前期中頃～後半（板付Ⅱa式～板付Ⅱb式）期の炭素14年代測定の結果と，過去に行った当該期の測定値をあわせて，西日本各地における灌漑式水田稲作（以下，弥生稲作）の開始年代と派生する問題について考察したものである。
対象とした遺跡は，新たに測定した福岡県大保横枕遺跡，徳島県庄・蔵本遺跡，鳥取県本高弓ノ木遺跡と，過去に行った福岡県福重稲木遺跡，同雀居遺跡，熊本県山王遺跡，大分県玉沢条里跡遺跡，愛媛県阿方遺跡，広島県黄幡1号遺跡である。
測定・解析の結果，板付Ⅰ式新段階の年代が前8世紀末葉の20年間ほどであることを初めて確認するとともに，板付Ⅱa式は前700～前550年頃，板付Ⅱb式は前550年～前380年頃，という2009年段階の結論を追認した。さらに鳥取平野の弥生稲作が，近畿よりも早い前7世紀前葉には始まっていた可能性のあること，徳島平野では奈良盆地や伊勢湾沿岸地域と同じ前6世紀中頃になって弥生稲作が始まっていたことを再確認した。九州北部を出発点とする，山陰ルート，瀬戸内ルート，高知ルートという3つの弥生稲作の東進ルートのうち，山陰ルートも他の2ルートとほぼ同時に拡散したことを意味する。
伊勢湾沿岸地域で弥生稲作が始まるまでの約400年のうちの約250年間，九州北部玄界灘沿岸地域にとどまっていた弥生稲作は，玄界灘沿岸地域を出ると，一気に鳥取平野～岡山平野～香川平野～高知平野を結ぶ線まで広がり，その後も5～60年で神戸，さらに70年で徳島，奈良盆地，伊勢湾沿岸まで急速に広がっていった。このことは，玄界灘沿岸地域と西日本では，縄文人の弥生稲作の受け入れ方になんらかの違いがあった可能性を示唆している。, This paper investigates when the wet rice cultivation with the irrigation system (hereinafter referred to as “Yayoi wet rice cultivation”) began in western Japan, as well as relevant issues, based on the radiocarbon dating for the time from the mid to latter half of the early Yayoi period (from the Itazuke II-a type to the Itazuke II-b type), whose date is controversial and called as the 2400 BP problem. The data were collected before and after the publication of “Calendar Dates for the Yayoi Period” (published by Yuzankaku) [Fujio 2009b].
In the past, we conducted dating tests of the Fukushige Inagi Site and Sasai Site in Fukuoka Prefecture, Sanno Site in Kumamoto Prefecture, Tamazawa Jori Site in Oita Prefecture, Agata Site in Ehime Prefecture, and Oban Site I in Hiroshima Prefecture. This time, we added three sites to the target list: Oho Yokomakura Site in Fukuoka Prefecture, Sho-Kuramoto Site in Tokushima Prefecture, and Motodaka Yuminoki Site in Tottori Prefecture.
The results of the dating and analysis confirmed for the first time that the new phase of the Itazuke I type had lasted for approximately 20 years at the end of the eighth century B.C. The results also agreed with the argument developed in 2009, dating the Itazuke II-a type to around the 700 B.C. - 550 B.C. period and the Itazuke II-b type to around the 550 B.C. - 380 B.C. period. Moreover, we reconfirmed that in the Tottori Plains, the Yayoi wet rice cultivation may have started in the early seventh century B.C., earlier than the Kinki region, and that in the Tokushima Plains, it had started in the mid sixth century, the same as in the Nara Basin and in the Ise Bay coastal area. This indicates the coincident extension of three Yayoi wet rice cultivation routes ‒ the San’in, Setouchi, and Kochi routes ‒ from northern Kyushu toward the east; the San’in route also extended almost at the same time as the other two routes.
It took approximately 400 years for the Yayoi wet rice cultivation to reach the Ise Bay coastal area. Although it had been confined to the Genkai Nada coastal area in northern Kyushu for the first 250 years, once it went out of the area, it rapidly spread out along the line from the Tottori Plains to Okayama, Kagawa, and Kochi Plains; and then arrived at Kobe five to six decades later; and at Tokushima, the Nara Basin, and the Ise Bay coastal area seven decades later. This implicates that there might have been differences between the Genkai Nada coastal area and western Japan in the way of Jomon people to accept the Yayoi wet rice cultivation.},
 pages = {113--143},
 title = {西日本の弥生稲作開始年代},
 volume = {183},
 year = {2014},
 yomi = {フジオ, シンイチロウ}
}