JOURNEYS THROUGH KOREA. 101 



mostly of a sandstone-nature, with ground quartz. 



The rectangular-mural Kyöng-juii (PI. XXIII. fig. 1) is locat- Kvöxg-jyu 

 ed on a flinty gravel flat thinly covered with sand between the 

 forks of a river. The thing that struck me most was the artifi- 

 cial relief on the flat, caused by a group of rather high mounds 

 about twenty in number, which resemble miniature volcanoes (PI. 

 XXIII. fig. 2). These mark the sites where the remains of the 

 kings of SlJ-Ja were interred, but some mounds were raised 

 simply as lookout stations. 



The plain of Kijoug-jgu lies between the ridges (PI. XXIII. 

 fig. 2) of the Tai-paik-san range, the western being that of the 

 Chhyöng-gycng-chJii already referred to '\ the eastern, that of Tho- 

 Jiam-san'\ which was the one we had just crossed. A Korean 

 geographer a century ago pointed out of the true topographical 

 situation of the plain and I have only to corroborate his view. 

 It is only 5 Im broad skirted on both sides by ridges of green 

 flinty tuflite of the " black series," the western being rather the 

 higher of the two ; but the flat extends in the north-soutli direc- 

 tion, and I took the south route over it to Ulsan. 



We marched by the ruined astronomical tower already men- 

 tioned, and then a crescent-shaped gravel-hill (Diluvium ?) under- 

 laid by the green flinty tufïite, opening to the west. It is the old 

 site of the Sll-la city of Uöl-scng ^\ so named from its shape. Our 

 road lay on an arkose sandy plain on the left side of the masanite^^ 



1) See anie, page 92. 



2) id: "a UJ -^ monastery of bigh antiquity is in this moiintain, ^vhicL is a part of the 

 T'ong-tai-san ridge. 3) ^ ^ij 



4) In structure the mnsanite stands between medium-grained granite and coarse aj)lite. 



Colored mineral is present only in a small quantity and so is biotite. Such is the case with 



the plagioclase. The entire rock is simply an eutectic aggregate of quartz and orthocJase in 



microscopically coarse intcigrowth, an implication-stiuctuie of the mcst iirçgular shape (see 

 ante, page 21). 



