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김주용(Kim, Ju-yong),양동윤(Yang, Dong-yoon),강상준(Kang, Sang-joon),이상헌(Yi, Sang-heon),남욱현(Nam, Wook-hyun),임재수(Lin, Jae-su),황세호(Hwang, Se-ho),윤현수(Yun, Hyun-su),김진관(Kim, Jin-kwan),홍세선(Hong, Sei-sun),이진영(Lee, J 忠北大學校 中原文化硏究所 2010 중원문화연구 Vol.14 No.-
Eurimji as an ancient water management facility has been known to be built in Iron Age(Sam-Han Age) according to historical document. Eurimji Bank materials are filled on the granitic gneiss and valley fill boulders and rounded water-laid gravels below 307m (asl). Artificial earth materials are gradually dominant at the altitude between 311.2m (asl) and 313.6m (asl). The constructed materials are chracterized by angular to subangular gravels and graded sands in lower part, but gray organic muds with sands are increased upwards. The organic muds up to 314m(asl) are dated ca2,000ysBP, while wood fragments are as old as 1,200yrBP in trhe same interval. This paper deals with the origin of the gray organic muds of Eurimji bank, particularly comparing it with Eurmji lake sediment records, dated as ca 1,900~2,000ysBP, in the interval of 307.5~311.7m(asl) of the borehole ER3-1. As result both Eurimji bank and lake sedimentary materials are the same in mineralogy and chemical composition. This implies that the ancient people excavated gray organic muds from Eurimji lake bottom and use them to construct embankment, made from earths and woods, on the natural lavee or elevated valley mouth due to alluviation. The Eurimji bottom sediments are traced as old as 1920yrBP from borehole ER-3-1, and records are continuous up to 1420ysBP. The lowermost bottom sediments are different in sedimentary matrix from the embankment materials at the same altitudinal level. The latter is typified by the gravel-supported bank materials at the level of 307.5~310.6m in altitude. This implies that a possible construction of Eurimji bank was as old as 1920 years, and bottom sedimentation in the Eurimji had been recorded continuously and stably up to 1200yrBP. However it is supposed that Eurimji bank was mainly constructed at 1200yrBP, when the unified Silla dynasty expanded water reservoirs in the whole country side.