IQ art: 1 — B. KOTÔ: 



hereafter such erosion hollows in many parts of Korea, always in 

 granitic districts. 



The No-ryöng range, so jar as we have seen, is a fold-mountain, and 

 is the oldest and the southernmost range of the Sinian system in the ivhole 

 peninsula. 



ß) After passing Chyon-jyir , and Kong-jyu, and crossing the 

 Keum Gang northwards to Seoul, we have to ascend the pass of 

 Chhya-ryöng^ to On-yang-do 3) . Broadly speaking, it is a synclinal 

 ridge of mica-schist mantle upon gneiss. It probably commences in 

 the Heuk-san Group 4) in the Yellow Sea, and runs through a 

 group of islets off the free port of Kun-san 6) . It then enters 

 Chhyung-chhyong Do, and makes the above-named Chhya-ryöng 

 pass. It is much disturbed on the north-east by the intrusions of 

 large masses of microgranite and granite-porphyry. 



The mica-schists disappear in the heart of Kang-uön Do, being 

 replaced by shallow folds of granite-gneiss, which are sharply faulted 

 in the Tai-koal-lyong region^ between Kang-neung and Ko-syong 7) , 

 still keeping the original direction of strike. The folded ridge, which 

 has been traced thus far, I call collectively the Chhya-ryöng range, 

 which trends from N.N.E. to S.S.W. It is the second of the geological 

 line, belonging to the Sinian System. 



The whole complex is cut down obliquely by the already- men- 

 tioned Koang-jyu fault towards the north-w r est. 



The No-ryong and the Chhya-ryöng ridges are both of the 

 Sinian System and are old earth-folds. On account of their 



1) The word jyu (>$\), affixed to local names, always si» - nifi<i6 a magisterial town of the first 

 class, enclosed in stone-walls. 



a) »a- s) fflÊS-iâ 



4) &wnâ - r ,) gftijft. 



