抄録
Along the Suttsu bay on the west coast of Oshima peninsula, Hokkaido, there are three marine terraces: namely Homme Terrace (120-80m), Suttsu Terrace (60-25m), and Yaoi Terrace (7-5m). The surfaces of bed-rocks underlying the Suttsu terraces are irregular in various ways. The author came to a conclusion that these irregularities were mainly due to crustal movements such as faulting and anticlinal formation. The faults run parallel to the Oshamambe Lowland.
From the analysis of the terrace deposits, the author identified the direction of the ancient beach drift. He also worked out the nature of the ancient climate in the Suttsu bay area, based on the plant fossil and the pollen analysis. The date of the Suttsu Terrace may be correlated to the Riss-Würm Inter-Glacial Stage in Europe.
