• 한국제4기학회지
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• 제18권1호통권22호
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• pp.41-46
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• 2004

영상강 하류 일대에는 여러 단의 하안단구가 발달되어 있다. 본 고에서는 이들 단구 중 현재까지 조사된 해면변동단구성 하안단구를 조사하여, 한반도 남동부 해안의 해안단구 및 해면변동단구와 대비하였다. 영산강 하류지역의 영산 18m 단구는 단구면, 단구구성층의 퇴적상 및 고토양 등의 특성으로 보아 남동부 해안의 최종간빙기 최온난기(MIS) 해성단구 및 해변동단구와 대비된다. 영산 18m 단구의 하상비고는 18m로서 남동부 해안의 최종간빙기 구정선고도와 일치된다.

• 한국지형학회지
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• 제23권2호
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• pp.47-59
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• 2016

The formation age and depositional environment of the marine terrace I of the estimated paleoshoreline altitude of 18m in Sanhari of Ulsan coast, southeastern Korea were investigated on the basis of examination of lithofacies and stratigraphy of terrace deposits. Marine deposits of the terrace is composed of rounded boulders(70cm in diameter) and rounded pebbles(1.0cm in diameter) which overlay them. The above rounded boulders which lie on the paleo-shore platform are considered to have been formed by wave abrasion in the same period that the paleo-shore platform was developed. The rounded pebbles which lie on the rounded boulder layer are considered to have been deposited in gravel beach and berm environment, judging from the laminae developed in this layer. The paleo-shore platform and marine rounded gravel layer of the terrace are assumed to have been formed in the large transgression period of the Last Interglacial culmination stage(MIS 5e), judging from the comparision of the formation age of 125ka B.P. of Juckcheon terrace I in the adjacent Pohang coast which was dated by amino acid dating. The terrestrial deposit of this terrace was largely composed of angular and subangular gravel mixed with marine rounded pebble which has been carried away mainly from the deposit of previous marine terraces and redeposited in this terrace. The lowest peat layer of terrastrial deposit was considered to have been deposited during the period from the late MIS 5e which is the estimated finishing time of deposition of the above marine gravels to the early stage of following regression period(MIS 5d) in which the sea level was still high. The sediments of angular and subangular gravel deposit which lie on this peat layer were assumed to have been deposited during the period from the early stage of the first regression period(MIS 5d) of the Last Interglacial to the Last Glacial. The lower part of the angular gravel layer is composed of the deposits of the fluvial and colluvial sediments, whereas most of the upper and middle part of the layer is mainly composed of angular gravels of colluvial sediments formed in the cold environment.