JOURNEYS THROUGH KOREA, 51 



sand is found at. Koawj-clan^'', No-dong "^ [Sa-dniv/), nud Pow/-näi^'^ 

 wliicli are 4, 8, and 10 km from Po-söikj, respectively. 



About 6 Jx'm west, we reached the very low hill-neck of the 

 PödeuI-cJihi *^ of the same spotted orthogneiss stretching northeast- 

 southwest, and after an lionr we were on the ratlier high pass 

 of Kamnam-chhi, wliere stands a single Kaiunam (persimmon) 

 tree overshadowhig a stone-tablet erected in honour of the heroic 

 deed of a certain Korean at the time of Taikô's expedition. The 

 ascent was on the same orthogneiss '^ ricli in l)iotite, with dull white 

 spots (4 mm) of orthoclase. From tlie to[) westwards, the over- 

 lying rock was the stiff lamellar ortliogiieiss ''''' consisting of 

 alternating laminas of quartz and orthoclase, and tiiotite, with a 



The sandstone is Iniilt up of angular splinters of cpiarfz and orthoclase particles and 

 mtiscovite, cemented with silicious crystalline particles mixed with coaly matter; and shows 

 symptoms of having been subjected to shearing by the shattering and undulatory extinction of 

 the quai-tz, its (hrty «aspect being caused by liquid inclusions of secondary origin. The rock is 

 rather a metamorphic t»itï than a normal sandstone. It is not easy to speak of the <age of this 

 sedimentary, but it appears to me to be of the same age as the LTpjier Ki/o uj-sawj formation 

 (Mesozoic), See ante, page 6fi. 



1) mm 2) )t m m m) 3) « n 



4) jf^p lll$. At about (Î km northwest from this iioint, Mr. Inouye saw gold washing at the 

 village Sa-chhang (ijth ■^) on the sheared orthogneiss rich in cpiartz. It lies in the same belt as 

 Pong-nîii-jyang already referred to. The gold-diTst is concentrated in the basal portion of a gravel 

 bed 8 feet thick, which makes the river-bed .and the underground of the paddy fields. The 

 placer is now nearly exhaiisted. 



5) Examined under the microscope the components arc orthoclase altered into muscovite 

 and strained quartz, sagenite-bearing biotite, and a few crystals of microcline. The mode of 

 their aggregation is such that the biotite encloses the colourless components in an eye-like 

 fashion so as to make them appear like white spots, and the high schistosity of the rock is 

 caused by the stream-like arrangement of the flakes of l)iotitc. The effect of mechanical action 

 is not observable except in the undulatory extinction in the quartz. A ijeculiar feature is that 

 the quartz encloses droji-like biotite, orthoclase and irregularly rounded qixartz. In short, this 

 schistOvse granite seems either to represent the extreme stage of metamorphism, or to have been 



ormed during a slow movement of a margin of magma in a state of piezocrystallization. 



6) The overlying stiff orthogneiss consists of an alternation of wavy and tapering laminre 

 of quartz and orthoclase with the tissue like liands and fd)res of decomposed biotite. In conse- 

 quence of this wavy structure, the colourless bands sometimes swell out almost into elongated 

 eyes. Both the quartz and the orthoclase are so completely crushed and dragged as to appear 

 in confused grains under crossed niçois. The rock represents the extreme product of myloni- 

 tization. It woiild be proper therefore to name it mylonite. 



