淀江平野の完新世古環境変遷

その他

The Holocene history of the Yodoe plain，westan Tottori Prefecture Southwest Japan，has been studied from Pollen analysis and by review of existing data．
On the basis of pollen stratigraphy the paleoenvironment is divided into eight local pollen assemblage zones（YD-VⅢ～Ⅰ）．YB-VⅢ to VⅡ：from about 7000 yr B.P. to 4000 yr B.P. ； YB-IV ： from about 4000 yr B.P. to 1250 yr B.P. ； YB-V to Ⅲ： from 1250 yr B.P. to 450 yr B.P.；YB-Ⅱ to I：from 450 yr B.P. to the present day．
The Holocene history of Yodoe plain is reconstructed in five stages（Stage 1 to 5）．
Stage1：Bay Stage，before about 7000 yr B.P.
Stage2：Coastal lagoon stage，from about 7000 yr B.P. to 4000 yr B.P.
Stage3：Swamp stage，from after 4000 yr B.P. to 1250 yr B.P.
Stage4：Marsh stage，from 1250 yr B.P. to before 450 yrB.P.
Stage5：Paddy field stage，from 450 yr B.P. to the present day．