Abstract
The land surface is covered by many kinds of land forms. They are usually classified morphologically or genetically, but not systematically. When we try to classify the land surface only according to the technical terms already named, we can find somewhere not to be able to be classified.
The author wishes to systematize the technical terms of geomorphology according to land form type. Each unit land. form covering the land surface is built up by several land forms parts. Land form part has only geomorphological meaning. Each land form type is built up by several land form parts and determined by the synthesis of four making conditions of (a) nearly the same time (b) nearly the same form (c) nearly the same genetics and (d) nearly similar materials.
The. differences between new and old ideas are as follows:
(l) Traditional. technical terms are mainly determined morphologically or genetically.
(2) In new idea one condition that each land form type is formed at nearly the same trine is added.
(3) Each, land form type is determined by the synthesis of four conditions. It is clear that a dissected fan does not belong to the same land form type as another fan newly made or now being made does. A dissected fan and a fan are grouped into the same land form family. Several land form types are grouped into land form. series according to the kinds of agency or environments of land form making. For example, fan, natural levee, delta made by the same river are sob jest to the same series. A land form area is builtup by several land form series.
