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Department of Physics Education, Sunchon National University, Jeonnam 540-950, KoreaAbstract: To investigate geomorphic development of alluvial plains and climatic environment change during the lateHolocene carbon dating, soil organic carbon analysis and humus analysis of sediments from alluvial plain ofHampyeongcheon basin were performed. The lowest peat layer was formed under warm and humid climates, which isconsidered to correspond to the Atlantic period in the Holocene. Yellowish brown sandy clay layer was deposited in thenatural levee, which we think were deposited in the generally warm and dry climates. The carbon dating age is 1,879-1,532 BC, and this period correspond to the Sub-boreal period in the Holocene. Light brown clay layer is assumed tohave been deposited in transitional environment from the natural levee to the back marsh. The climatic environment waswarm and humid, which is considered as transitional period from the Sub-boreal to the Sub-Atlantic in the Holocene.Light yellowish brown and light brown clay layer of the upper part are regarded as sediments of the back marsh. Lightyellowish brown clay layer was deposited in the cold and dry climates, which is considered to correspond to the Sub-Atlantic period in the Holocene. Light brown clay layer was deposited in the warm and dry climates. The carbon datingage is 211-427 AD, this period corresponds to the Post Roman Warm Period in the Holocene.Keywords: Holocene, climatic environment change, humus analysis, alluvial plain, Hampyeongcheon basin:               (AMS, Accelerated Mass Spectrometry),   .      ,   Atlantic   .   ,        .   1,879-1,532BC ,     Sub-boreal .        .    ,   Sub-boreal Sub-Atlantic    .        .        ,     Sub-Atlantic   .         .   211-427 AD,   Post Roman Warm Period   .: , , , ,

Humus Analysis for the Geomorphic Development and Climatic Environment Change of Alluvial Plain in Hampyeongcheon Basin during the Late Holocene