On the River Terrace of Doshi-gawa, Kanagaiva Prefecture

Abstract

In this paper, the origin of asynmetrical river terrace of Dosi-gawa (river) hass been considered. From the shape of terrace and the distribution of terrace gravel, it is concluded that Doshi-gawa is an example of C. A. Cotton's “Valley-side superposition, ” and the lateral sliding of the trunk river on the ancient valley floor was caused by the pushing of fan-shape deposits of tributaries. And, the asynmetrical pressure of tributary deposits are derived from the difference of catchment areas and bights on both side sloes of the trunk river.