78 ^ET 2. — B. Koro : 



geologic map, they will unequivocally mark out the western 

 margin of the Chiri-san sphenoid. 



Proceeding eastwards we saw a gold placer being worked 

 in gravel of muscovite- schist, and the rock was soon replaced by 

 crushed porphjrltlc biotite-granite which is clearly visible on the 

 ascent to the Pi-hong -cJihi^^ pass (215 m). Since leaving Moh- 

 2)ho, this was the first ridge passed that deserved the name. It 

 distinctly delineates the westernmost range of the Chiri-san 

 sphenoid, and runs parallel to the belt of the muscovite- schist 

 already cited ; it can be geologically traced from the Kamnam-chhl 

 mentioned in the first traverse ^\ After the descent on the other 

 side we had farther to climb up and down three low undulat- 

 ing hills of sheared granite, sometimes intruded by dykes of 

 grayish bostonite with chloritized biotite, which is fast dis- 

 aggregating and weathering into reddish sandy earth. Finally, 

 we went over from Sai-sul-niak''^ along the forested foot of the 

 old castle Kyo-ryong-san^^ to Nam-mn. 



Nam-uön Nam-mn is an important eiunnäi located in the centre of an 



intermontane in-filled basin, only 50 m above sea-level (PI. XIII. 

 ßg. 3). It is on the high road of ChyOl-la-Do, which starts from 

 Sun-chyon on the south coast, being located at the cross-road 

 leading west and east via Un-bong ^\ lb was a not unimpor- 

 tant inland post for Japanese landing either at Sun-chydn^'^, or at 

 the mouth of the Söm-jin-gang'^ on their way to the now forlorn 

 capital of the defunct kingdoin of Paik-chydi, on the plain of 

 Kun-san. Its destruction in 1597, during Taiko's expedition, left 

 an indelible resentment in the hearts of the people. 



The basin is enclosed by mountains, opening only towards 



1) m ßfä Ü!e 2) See ante, page 51. 3) ^ jg ffi i) m tl Hi 5) g J^ 

 6) See ante, page 46. 7) See ante, page 41. 



