JOURNEYS THROUGH KOREA. 91 



east-west direction (PI. XIX. fig. 2), and on the east (PI. XX. 

 fig. 1) a meridional ridge of tlie greenish flinty tuffite rims along 

 the distant horizon. We tlien crossed the Kemn-ho-gang '^ to 

 Pan-ga-mi'^ where the granitic masanite blocks from Phal-l'ong- 

 .mn are seen scattered through the village. Next comes the 

 terrane of blackish shale, sometimes marl}^, and at Pong-su- 

 cligön^\ the front eiimnäl of Ha-gang, a light-colored, medium- 

 grained biotite-granite was observed on a cliff intruding a short 

 distance into " the black series ". It is undoubtedly an offshoot 

 of the Phal-Jtong-san masanite, and this exposure gave us the 

 key for determining the young age of this intrusive 

 as compared with the rocks of the Upper Kgong-sang 

 formation. 



Proceeding, we rode due east on a rather sandy flat for 6 

 km, witli Hoa-san (806 m) ^^ and Pong-nim-^^an ^* in full view on 

 the north at a distance of 18 km, forming an east- west ridge 

 and making the south rini''^ of the extensive flat (300 m) of An- 

 d'ôV^ on the red formation. Four kilometres further on, our 

 route left the river and turning to the northwest brought us to 

 the foot of a low hill-pass. The terrane was in the black shale 

 which was being worked for gold in placer. The auriferous 

 quartz reef in the marly shale is of the same type as those of 

 Chhgang-ngöng^^ and Yong-dam^^. This is the type of ore-deposits 

 which is called marl gold ^"l 



On the north side of the hill on the river-bank is situated yö^o- 



CHHXÖK 



1) ^ m VL 2) ^ s ;3 3) 'jt m m 4) ^ U4 s) m ^ uj 



6) This ridge is produced by the flanking bed of the Jdark series which slopes southwards 

 leaning upon the horizontally liedded red formation on the north. 7) ^ ^; 



8) See ipage 88. 9) See footnote, page 25. 10) See ante, page 32. 



