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This paper aims to review the building process and dating of perpendicular extension tombs of the Yeongsan River Basin by comparing and examining Naju Sinchon-ri Tomb No. 9 and Bokam-ri Tomb No. 3. It was confirmed that the perpendicular extensions observed at both tombs took place over a relatively short period of time, forming an inclined plane around the top of each tomb. The cross-dating of artifacts (the flat cup with cover and jar coffin) from Sinchon-ri Tomb No. 9 and Bokam-ri Tomb No. 3 Tomb provided information on chronology. Flat cups with covers and jar coffins dating to earlier than the late fifth century AD could not be observed in the lower layer of Sinchon-ri Tomb No. 9, suggesting that its construction took place around the same time as Stone chamber 96 of Bokam-ri Tomb No. 3. Accordingly, it appears that the vertical extension of tombs was a building method prevalent in the Yeongsan River Basin for a very short period before and after the sixth century AD. Around the same time, Long Drum-shaped tombs were built in the middle and upper reaches of the Yeongsan River. Bokam-ri Tomb No. 3 and Sinchon-ri Tomb No. 9, situated in the middle reaches of the Yeongsan River, reflect the introduction of various cultural elements into the indigenous cultural context.


This paper aims to review the building process and dating of perpendicular extension tombs of the Yeongsan River Basin by comparing and examining Naju Sinchon-ri Tomb No. 9 and Bokam-ri Tomb No. 3. It was confirmed that the perpendicular extensions observed at both tombs took place over a relatively short period of time, forming an inclined plane around the top of each tomb. The cross-dating of artifacts (the flat cup with cover and jar coffin) from Sinchon-ri Tomb No. 9 and Bokam-ri Tomb No. 3 Tomb provided information on chronology. Flat cups with covers and jar coffins dating to earlier than the late fifth century AD could not be observed in the lower layer of Sinchon-ri Tomb No. 9, suggesting that its construction took place around the same time as Stone chamber 96 of Bokam-ri Tomb No. 3. Accordingly, it appears that the vertical extension of tombs was a building method prevalent in the Yeongsan River Basin for a very short period before and after the sixth century AD. Around the same time, Long Drum-shaped tombs were built in the middle and upper reaches of the Yeongsan River. Bokam-ri Tomb No. 3 and Sinchon-ri Tomb No. 9, situated in the middle reaches of the Yeongsan River, reflect the introduction of various cultural elements into the indigenous cultural context.