JOURNEYS THROUGH KOREA. 15 



its base in the interior, extending over 80 kilometers. The 

 kernel of the laccolith lies to the east of the Nak-tong river, 

 culminating on the height of Keum-jyong-saii, on the top of which 

 is situated the spacious walled castle of the same name which 

 once served as a stronghold against the ingression of the Japanese. 

 The Keiim-J i/'ông laccolith is limited on the north by the valley of 

 Yang-san ^\ and the south-eastern slope is mantled with the green 

 rocks. Especially instructive is the remnant of this mantle as 

 an inlier on the north-eastern slope. Deep in its recesses we 

 find the Buddhist monastery of Po-ma-sap much frequented by 

 foreigners. 



The granite of the Keum-jgdng '^^ laccolith presents special features keumSÎong 

 which characterize the rock as distinguished from the rest of .-*'^'™"'^° 

 this group, and its distribution is by no means confined to 

 this region, but is scattered over many parts of the peninsular 

 area where, the same condition obtains. It has a buff'- color and 

 a medium to rather coarse structure, easily crumbling into débris 

 and sand so as to make it a very diflScult task to get a fresh 

 specimen. It is poor in colored minerals and accessories, con- 

 sisting mainly of quartz and orthoclase accompanied with a little 

 biotite and oligoclase. The components of this simple, monotonous 

 leucocrate are all of equal size, having the appearance of 

 simultaneous crystallizations intergrowing one another pegmati- . 

 tically, though lacking the regularity of the structure of graphic 

 granite. With this coarseness of the structure the so-called 

 implication- structure disappears, finally presenting a mere inter- 

 locking of allotriomorphic components. Good crystals of the 

 oligoclase sometimes serve as the nucléons of ßesh-colored 



1) ^ III 2) ^ ^ # 3) ^ ^ Uj 



