Okayama University A new keyhole-shaped burial mound was discovered in Tsushima!

National University Corporation Okayama University
[Okayama University] A new keyhole-shaped burial mound was discovered in Tsushima!

January 23, 2023
National University Corporation Okayama University
https://www.okayama-u.ac.jp/
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-Points of announcement-
In 1908 (Meiji 41), I discovered that a keyhole-shaped tumulus was reflected in a photograph taken when the army camp was being built (present-day Tsushima, Kita Ward, Okayama City).
Although it has already been lost, it was known that there was a group of burial mounds including keyhole-shaped burial mounds in Tsushima. This time, as a result of comparing it with past research and cadastral maps, the one in the photo was recognized as a new keyhole-shaped tumulus.
It has been revealed that several keyhole-shaped burial mounds were built in the latter half of the 5th century on the plains of the western bank of Asahikawa including Tsushima. It shows that the Kibi group split into multiple smaller groups after the Tsukuriyama mounded tomb.
◆Overview
In March 2022, an old photograph from the construction of the 17th Army Division was brought to the Research Center for Archaeological Properties of Okayama University (currently the Cultural Heritage Management Department of the Research Institute for Dynamics of Civilization, Okayama). I discovered that there is a ridge that has been divided into the ground.
It is known that several ancient tombs, including keyhole-shaped burial mounds, were clustered together in Tsushima Fukui at the foot of Mt. Handa. Among them, there is a detailed report on the
keyhole-shaped burial mound called Otsuka-sama Kofun, which is estimated to be about 30 meters long and dated to the late middle Kofun period (late 5th century).
This time, we verified whether the discovered keyhole-shaped land division can be recognized as a keyhole-shaped tumulus, and as a result, we came to the conclusion that it is appropriate to recognize it as a keyhole-shaped tumulus. Next, we checked whether this keyhole-shaped tumulus was a Tsukasama tumulus or not, and found that it was a different keyhole-shaped tumulus from the Otsukasama tumulus. Following the customary practice of using small letters when naming sites, we named the keyhole-shaped burial mound that we discovered “Tsukano-mae Kofun.”
From this discovery, it has been speculated that multiple
keyhole-shaped tumuli were continuously constructed in the latter half of the middle Kofun period (the latter half of the 5th century) in the plains downstream of Asahikawa. After the Tsukuriyama Kofun (Kita Ward, Okayama City), the process by which the Kibi group split into multiple smaller groups and became independent became clearer. [Image 2

Tsuka-no-mae Kofun, a keyhole-shaped burial mound newly discovered in Tsushima. Photo taken in 1908 (private collection, provided by the owner)
[Image 3

Current Tsushima Campus of Okayama University (Kita Ward, Okayama City) A word from Assistant Professor Takahiro Nozaki
I never expected that a keyhole-shaped tumulus would appear in a photograph taken in 1908 (Meiji 41) when the 17th Army Division was being constructed. It was lost due to development after the war, and most people have never seen it. Once we solved the problem of the discrepancy in the lot number, we solved one problem after another, and finally came to the conclusion that it was a newly discovered keyhole-shaped tumulus.
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Assistant Professor Takahiro Nozaki
◆ Presentation of research results
The results of this research will be presented at the first special exhibition of the Research Institute for Dynamics of Civilization, Okayama University, “From Tsushima to the World, from the World to Tsushima” (Venue: Okayama City Museum, Dates: February 10 to March 19, 2023). We will exhibit the breaking news at.
Details of the exhibition can be found on the website of the Institute for Civilization Dynamics.
　https://ridc.okayama-u.ac.jp/20221117-1865/
◆ Detailed research content
A new keyhole-shaped burial mound was discovered in Tsushima! 　https://www.okayama-u.ac.jp/up_load_files/press_r4/press20230120-1.pdf [Image 5

◆ Reference
・Research Institute for Dynamics of Civilizations, Okayama University (RIDC) 　https://ridc.okayama-u.ac.jp/
◆ Reference information
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◆ Inquiries regarding this matter
Takahiro Nozaki, Assistant Professor, Research Institute for Dynamics of Civilization, Okayama University
　Tsushima Campus, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama City, Okayama Prefecture 700-8530
　TEL: 086-251-7290
　FAX: 086-251-7290
　https://ridc.okayama-u.ac.jp/
-Inquiries regarding industry-academia collaboration at Okayama University- 　Okayama University Organization for Research Promotion Headquarters for Industry-Academia-Government Collaboration
　1-1-1 Tsushimanaka, Kita-ku, Okayama City, Okayama Prefecture 700-8530 Okayama University Tsushima Campus Main Building 1F E-mail: sangaku◎okayama-u.ac.jp
*Please replace ◎ with @.
　TEL: 086-251-8463
　https://www.orsd.okayama-u.ac.jp/
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