（93）西都原古墳群特集・④第２古墳群（100号墳)
(93) Special feature on the Saitobaru Kofun Tumulus Group, ④The 2nd Kofun Tumulus Group (No. 100)
柄鏡型の前方後円墳で全長は57.4ｍ
後円部の直径は32.4mで傾斜は1段目が約30度、2・3段目が約25度となっており1・２段目のテラス幅は80cm前後。
前方部の長さは東側で26m・西側で24mあり、前方部先端幅は17.5ｍ程度で傾斜は後円部とほぼ同じ。
Mirror-shaped posterior frontal mound.Total length 57.4m
The diameter of the posterior circle is 32.4m.
The slope of the first terrace is about 30 degrees, and the second and third terraces about 25 degrees.
The width of the first and second terraces is about 80cm.
Frontal length is 26m on the east side and 24m on the west side.
The width of the front end is about 17.5 m.
The slope is almost the same as that of the back circle.
後円部は3段築成、前方部は2段築成で、各テラスは互いに不整合無くつながっている。
墳頂平坦面は前方先端から後円部方向へ緩やかに下降した後、
若干上昇気味にくびれ部へ向かう。
The back circle is built in three stages, and the front part is built in two stages.
The terrace is connected to the posterior part without any inconsistency.
The flat surface of the top of the mound descends gently from the front tip toward the back of the circle, and then rises slightly toward the neck.
茸石は墳丘斜面部全面から検出され、テラス上は認められなかった。
前方部・後円部ともに各段の斜面部端に根石が1列（部分的に2列）廻っていた。
周溝は後円部をほぼ全周する可能性が高いとのこと。
Mushroom stones were found on the entire slope of the mound, but not on the terrace.
In both the front and back sections, a row (partially two rows) of root stones was found around the edge of each slope.
There is a high possibility that the perimeter ditch almost circumscribes the rear circle.
埋葬施設は地下レーダー探査で深さ1．8m前後の地点で
長さ5～6m・幅2～3m程度の主体部があると考えられる。
The burial facility is thought to have a main part of 5-6m in length and 2-3m in width at a depth of around 1.8m according to underground radar survey.
後円部墳頂平坦面中央部付近で数個体の高杯及び壷形土器が出土
Several high cups and vase-shaped earthenware were excavated near the center of the flat surface at the top of the posterior mound.
築造はAC310-350年ごろ（4世紀前半～中頃）
The tomb was built around 310-350 AC (early to mid-4th century).
次回は第２古墳群（90号→83号→109号墳）
Next time: The 2nd Kofun Tumulus Group (No. 90 → No. 83 → No. 109)
引用／2005古墳分布南端域における出現期古墳の実証的研究（KAKEN）・「特別史跡西都原古墳群発掘調査報告書第3集 西都原100号墳」・現地説明版・探訪ガイドMAP・一般財団法人みやざき公園協会「特別史跡公園西都原古墳群」HP
Citation: 2005 Empirical study of emergence-period burial mounds in the southern end of the burial mound distribution area (KAKEN), "Special Historic Site Saitobaru Kofun Group Excavation Report Vol. 3: Saitobaru 100-go Mound", Local explanatory version, Sightseeing guide MAP, Miyazaki Park Association "Special Historic Site Park Saitobaru Kofun Group" HP
翻訳・Deep pro