北海道海岸平野における完新世堆積環境の変遷 : 2. 釧路湿原堆積物の珪藻遺骸群集

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IHIRA, Masashi (Dept. Biol., Fac. Sci., Kobe Univ., Kobe), MAEDA, Yasuo (Kobe City Inst. Educ. Res., Kobe), MATSUMOTO, Eiji (Marine Geol. Dept., Geol. Survey Japan, Ibaraki) and KUMANO, Shigeru (Dept. Biol., Fac. Sci., Kobe Univ., Kobe). 1985. Holocene sedimentary history of some coastal plains in Hokkaido, Japan. 2. Diatom assemblages of the sediments from Kushiro Moor. Jap. J. Ecol. 35 : 199-205. Diatom assemblages of the sediments from the peat bog along the Toya River, which flows through the east edge of Kushiro Moor, were analyzed to clarify the change in sedimentary environments caused by Holocene sea level changes. The results were as follows : (1) There was the neritic or littoral region of paleo-Kushiro Bay. (2) In the upper part of Md zone, this site changed into a sandy shore. (3) In the Tr-2 zone, this site rapidly changed into a freshwater condition. (4) That change finished bofore 4,090±240 y.B.P. (5) Then, this site developed into a peat bog and streams began to flow in the subzone FD-2 in this site.
1985-06-30