JOURNEYS THROUGH KOREA. 47 



a tectonic valley to Nak-an ''. The southern hill-ridge which sepa- 

 rated our route from the inlet of Yö-chä ^^ was less regular, while the 

 northern one was rather high. On the way there were two passes, 

 the Cfn-c/yöng-chhi^^ and the Pul-cJthi^\ From. Sun- chyöii, we trod 

 the terrane of a lamellar orthogneiss rich in biotite, with small 

 spots of white ortlioclase as far as the east foot of the latter pass 

 (320 7n) when we came across a new rock whicli appeared in 

 the form of a laccoHth. My specimen ^^ is Hght, friable, red- 

 dish granite-porphyry composed of flesh-colored and dull white 

 (decomposed) ortlioclase, rounded quartz and some idiomorphic 

 biotite. Miarolitic druse is abundant with crystals of quartz and 

 ortlioclase of the usual habit hanging from the wall. The presence 

 of these minute drusy spaces makes the rock so light and rough 

 as to appear at flrst glance like a rhyolite, but the texture is 

 holocrystalline and granitic. That the present rock is a laccolith, I 

 am led to think from experience in Chu-goku ^'\ Japan, where similar 

 rocks occur abundantly, in connection with the marginal facies 

 of aplitic granophyres. The latter seem by no means rare in 

 Korea and China. Piinnes tsinr/taulfe "' is likely one of these 

 varieties found in Kiau-chau. The Pul-chhi pass with the rugged 

 Chi)'én-san ^^ on the north on whose to^) is located the Keum-gang-an 

 pagoda, and O-hong-san^'^ on the soutli are built up of the same 

 rock, and the circus-like depression of N'ak-cm ^"\ to which the 



i) ^m 2) ?fe É 3) tüj tt 4) -/c ft? 



5) Mr. Inouj'é collected n, fresli specimen of Iniff- coloured rock with flesh«coIored pbenocryst 

 of orthoclase (1 cm) and rotind quartz. The latter is remarkahle for its enclosures of irregularly 

 elongated orthoclase (decomposed), all oriented in the same direction, — it is antl-myrmekite. 

 The groundmass is simi)ly a coarse intergrowth of quartz and orthoclase, the former being con 

 tinuous from i)heuocrystic quartz — a unique phenomenon. Only a few small and idiomorphic 

 crystals of plagioclase, hornblende and biotite are i^resent. It is (junrlz-tsinjlmiile. 



6) For example rear TakeiLx, 14 km north of the Ikuno mine, Tajima prov. 



7) Zeitschr. d. D. geol. Gesell. Bd. 5G . S. 144. 8) ^ |î Uj 'J) ïl »$ Ul 

 10) This village is noted for linen, bambocvgoods, cotton-wool, and rice. 



