（92）西都原古墳群特集・③第２古墳群（81号墳)
(92) Special feature on the Saitobaru Kofun Tumulus Group, (3) The 2nd Kofun Tumulus Group (No. 81 to No. 100)
第2古墳群は
柄鏡型前方後円墳10基を含む39基確認。
築造はAC250-340年（3世紀半ばから4世紀初め）
Thirty-nine tumuli were found in the 2nd tumulus group, including ten mirror-shaped posterior frontal tombs.
They were built between 250-340 AC (mid-3rd century to far-4th century).
ご紹介順は前方後円墳の築造順に81号墳→100号墳→90号墳→83号墳→109号墳
The tombs are introduced in the order of their construction: No. 81, No. 100, No. 90, No. 83, and No. 109.
今回は第２古墳群・81号墳
Tumulus No. 2, Mound 81
私が立っているのが柄鏡型の前方部
81号墳は、第二古墳群の南端にある柄鏡型前方後円墳で
唯一前方部が北を向いている。
墳長53.7m、後円部直径37.5m、後円部高3.7〜6.9m、
前方部長20m、前方部高さ1.2〜1.6m
Located at the southern end of the Second Tumulus Group, this is the only mirror-shaped post-anterior circle tomb with the front part facing north.
Mound length: 53.7 m; posterior circle diameter: 37.5 m; posterior circle height: 3.7-6.9 m; anterior section length: 20 m; anterior section height: 1.2-1.6 m.
後円部から低いなだらかな前方部を望む
写真右側のくびれ部に突出部
奈良県の纒向石塚古墳とほぼ等しい比率をもつ墳形。
墳丘は後円部のみ2段築成、前方部前面を除いて周堀がある。
後円部南側に突出部があり
上部平坦面外周に石組みが全周する
The shape of the mound is almost equal in proportion to that of the Garou Ishizuka mound in Nara Prefecture.
Only the posterior part of the mound is built on two levels, and there is a moat around the front part of the mound.
There is a protruding part on the south side of the rear circle.
A masonry structure completely surrounds the outer circumference of the upper flat surface.
埋葬施設は突出部上面、くびれ部、後円部上段墳丘斜面から4基確認。
Four burial facilities were found on the upper surface of the protruding section, at the neck, and on the slope of the upper mound of the rear section.
築造時期はAC260-290（3世紀後葉）と推測。
The date of construction is estimated to be 260-290 AC (later part of the 3rd century).
次回は第２古墳群（100号墳）
Next time: The 2nd Kofun Tumulus Group (No.100)
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）・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), Sightseeing guide MAP, Miyazaki Park Association "Special Historic Site Park Saitobaru Kofun Group" HP
翻訳・Deep pro