兵庫県加古川中下流域の段丘地形

概要

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Fluvial and marie terraces are well developed along the middle and lower courses of the Kako River. The author classified these terraces into Upper I terraces, Upper II terraces, Middle terraces, and Lower terraces in the descending order, and correlated them as shown in Fig. 4 and Tab. 3.In this paper, the forming condition of Manshoji terraces (Upper I terraces) which are extensively developed and have thin deposits in the middle course of the Kako River is especially discussed, and whether marine terrace exists or not in Kunioka terraces (Upper II terraces) in the lower course of the Kako River is also discussed. The results are summarized as follows.(1) Manshoji terraces are considered to have been formed in the condition that the Palaeo-Kako River and its tributaries flowed in the slightly undulating hills in the state of few supply of gravels from the surroundings.(2) Kunioka terraces are divided into higher and lower terraces. The left bank of the Kumori River in lower Kunioka terrace is considered marine terrace because of containing trace fossils and topography of bars.
日本第四紀学会の論文