津山市南方に分布する侵食小起伏面 <論文>

The distribution of low-relief surfaces was studied to the south of Tsuyama, Okayama Prefecture. In the Chugoku district, four kinds of the low-relief surfaces are commonly known as the Mountain range surface, the Kibi surface, the Sera surface and the Setouchi surface. The Setouchi surface is subdivided into the three surfaces. In this area, six kinds of the low relief surfaces are recognized; I- to VI-surfaces from higher to lower level. The I-surface corresponds to the Mountain range surface, the II- and III-surface to the Kibi surface, the IV-surface to the Sera surface and V- and VI-surfaces to the Setouchi surface. The distribution pattern is different from that in the central southern area of the Chugoku district(eastern Hiroshima Prefecure and western Okayama Prefecture)where the low-relief surfaces are typically developed. In the studied area, higher level surface is surrounded by the lower level surfaces, on the other hand, in the central southern area of the Chugoku district, the higher level surface distributed in the northern part and the lower level surface in the southern part as like being terraced. This difference is probably due to the difference of the geomorphologial processes within the Chugoku district.