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The writer has studied the terraces and gentle slopes of erosional origin in the three valleys of the Northeastern Hokkaido, and classified them and correlated their date of development. The relations are shown in the following table. Some of the longitudinal profiles of river terraces of the Shokotsu as well as those of the other two rivers intersect one another (Fig. 3). Such relation may be attributed to the eustatic movements of sea level as well as to the tectonic movements (gradual upheaval of the upper course area). Nevertheless the latter element is not discussed here, and perhaps it is impossible to distinguish whether the influence was by former or the latter.Judging from the thickness of terrace deposits and deposits forming the coastal plain, the writer came to the conclusion that the teustatic movements here were more significant and universal than the tectonic ones.At the time of the formation of terraces when the sea level, namely the base-level of erosion had sunk there developed the gentle slopes of erosional origin. Judging from the structure of those gentle slopes, it is sure that there worked some erosion force from both sides of the valleys and that the erosion must have been different from such that forms the terraces. It may be presumed that in such a period cool climate prevailed, and vegettion was poor.

Gentle Slopes of Erosional Origin in the Valleys of the Northeastern Hokkaido