128 A^'T- 2. — B, EOTÔ: 



granite prominence of Tög-yu-san ^^ which is freqnently mentioned 

 in works on the geography of the peninsnla. 



Tög-yu-san (PI. XXX. Jhj. 2) and its neck, the Yiik-sim-nyöng 

 pass, are direct prolongations of the pass of Yö-nö)i-chhi'-^ trend- 

 in<'' here northeastwards to the well-known Tai-t'ôh-san''^ between 

 Ma-jyu and Chi-ry'ôi. The southern flank of Tög-yu-san descends 

 precipitously into a gulch from which a deep valley starts south- 

 wards. The road descends to the very bottom (360 m) of the 

 valley. As the coarse porpliyritic gneiss-granite has the shear- 

 plane dipping west, the ascent is gradual from the side on the 

 pseudo-cleavage face, but the descent to the east is steep, the 

 road zigzagging down a basset of schistose rocks, about 330 m in 

 thickness. A similar cul-de-sac of its south neighbor with the 

 same orientation was seen far up the Ham-yang valley, and 

 both are so closely related that they seem to have a common 

 geotectonic structure. 



Our valley turned at first southeast, then northeast, travers- 

 ing the core of tlie axis of another ridge, here called Hoang-sök-san. 

 The ridge, which has some prominent features and a monastery, 

 comes from the Phal-liydng-chhi, mentioned in the Second Tra- 

 verse '\ and ends at Tai-töh-san on the north. The rocks are of 

 the Yuk-slm-mjdng type, but a little finer with large microcline 

 crj^stals. About 5 hn this side of An-eul''^ {Koan-bcuk), they 

 become gneiss-granite and Augen- Lagengnelss with the vertical 

 plane of schistosity trending N.öO" E. Here the clear stream runs 

 down a tortuous channel with a deeply eroded bed broken by 

 low cataracts. 1 saw a fine summer-house (PI. XXX. ßg. 2) in 

 the shadow of the forest on the river bank, — a choice spot for 



1) W: t'tf \U 2) See ante, page 80. 3) See ante, page 125. 

 4) See ante, imge 81. 5) ^ gSc 



