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유경아 ( Kyeong A You ),유영석 ( Young Seok You ),홍진택 ( Jin Taek Hong ) 한국도서(섬)학회 2011 韓國島嶼硏究 Vol.23 No.4
This study is concerning the previous researches, "the Geology and Coastal depositional environment of Bigeum" and "Dochodo, Shinangun, chonnam." The geology of these islands consists of shale, tuff and feldspar porphyry in the Cretaceous of Mesozoic. The mudflast and beaches of the islands is constructed by fine sediments that have been transported by the sea and tidal current. The waves and storms influence the sea and tidal current as well as the sorting of sediments. The Simok and Myeongsasimri beaches are very well sorted areas in Shinangun.
유경아 ( Kyeong A You ),오강호 ( Kang Ho Oh ),홍진택 ( Jin Taek Hong ) 한국도서(섬)학회 2010 韓國島嶼硏究 Vol.22 No.4
This study was carried out by the investigation on the geological and beach depositional environment of Chodo and Sonjukdo, Samsan-myeon, Yeosu city. The geological features of this area consists of sedimentary rocks such as shale, sandstone and tuffaceous conglomerate which belong to the Kyeongsang system deposited during the cretaceous period, and also igneous rocks which are andesite, granodiorite(Masan rock), granite porphyry and lastly intermediate dyke rocks which were intruded at the end of the cretaceous period. Beaches which are well developed in Jinmak (Jeongkang), Daedong and Sonjuk, are made up of silty, well-sorted sand. The sandy sediments are mainly quartz and fragments of the andesite in Chodo and granite porphyry in Sonjukdo. Ground water is mainly developed in the weathering zone, and alluvium deposits in the base rocks of granite porphyry, and the granodiorite(Masan rocks) intrude the Chodo and Sonjukdo areas. In particular, sediments in the bottom of the sea are deposited in the angular sediments with a diameter of 1~2m and exposed between the Chodo and Anmok islands, two times (3 days) per month at low tide time. Overall tourists are indeed likely to be very attracted with the interesting elements of the region.