Abstract
Nearly one year ago the present author published the results of the study concerning the evenness of the elevated peneplain of the province of Mikawa in Japan(1). Tyûgoku Peneplain in southwestern Japan has also been studied from the same standpoint, although the result is not yet in print(2).
In the present work another attempt is made to show the same sort of examples of the cuntinetal part of far eastern Asia. The area chosen is the Kwantung (_??__??_) Region, the southern tip of the Liantun (_??__??_) Peninsula, where maps of high exactness are obtainable.
64 topographical sheets (1:25000) have been published by the Kwantung Government, and out of them 12 sheets, which represent the most typical areas, were selected for this study. Evenness was measured with the same method, which was once adopted to determine the evenness of the Mikawa Plateau
Evenness E is defined as
_??_
where R is the altitude difference in meter between the highest and the lowest points within a circle of 1 spuare kilometer. The center of the circle is chosen at the point of a corner of a mesh with one side 500 meters in length.
As many as 3241 points are measured. The results are shown in Table 2, and for the whole area E=38.5. This is an extraordinarily large value, when we consider that the evenness of the elevated peneplains in Japan gives below E=10.
If we calculate the frequency of the value of evenness, E=40 gives maximum value as shown in Fig.1: that is to say, 410 cases out of 3241. E=50 is next to the largest frequency. The curves in the Figures 2-13 show the frequency of E in the respective sheets. From these we find that a portion of the curve with high frequency may be regarded as symmetric.
Comparing the curves with the major physiographic features of the area represented, we find that a portion of high freuency in the curves represents the area of well developed peneplain, and that the remaining portion, which has but little frequency, doudtlessly indicates the existence of monadonocksa Fig. 14 is the map showing distribution of evenness, and the iso-evennessl ine of E=16.7 is drawn with specially thick line, because this line is considered to be the boundary between the peneplain and the monadonocks.
After all, the most provable value of evenness is 40, but on the average it is reduced to 38.05 on account of the existence monadonocks.
