JOURNEYS THROUGH KOREA. 159 



H.0 ^'°'f"^^ Coke. Ash. S. 



matter. 



9.78 8.29 58.02 29.91 0.38 



The semiciystalline or epiciystalline series dips S.E., and 

 makes up the terrane as far as Tong-jJol; capped by green por- 

 phyrite. 



Near Ponci-ncd-jyang '\ and midway between Tong-pok and 

 Po-söng, Mr. Inouyk found a rock similar in appearance to gra- 

 phite-schist (p. 49 [5] ). It is of the type No. 3, and its black color 

 is due to the presence of magnetite in chloritic film. It is a 

 mylonite from either quartz-porphyry or quartz-dioriteporphyrite. 

 The original home of the placer gold found near-by is not known. 



From Tong-poU northward to Ok-hoa (p. 68), a typically green 

 ottrelite-Qohi^t and heraatite-ottrelite-schist occur in association 

 with mashed quartzose rock containing tourmaline and zircon 

 (igneous origin), and at one place covered with crystalline - 

 limestone conglomerate. The complex is probably the northern 

 prolongation of the graphitoid bed of Kul-am already referred to '\ 

 Farther on northwards to Ok-koa, the psammitic muscovite-schist 

 of the Kang-jin series emerges from below this Pliyllite series. 



III. h. The Mu-an''^ Complex. — In the environs of Mil- 

 an, 24 km north of the port of Mok-pho, a graphite-sericite-scliist 

 of the type No. 3 makes its appearance, being greatly decom- 

 posed into red earthy, thinly-split shingles, striking N. 45^ E., 

 with the dip S.E. The slide shows the rock to be of the same 

 sort as those of Tong-pok and Pong-ncd-jyang already mentioned, 

 with corroded quartz enveloped in phyllitic membranes, thus 

 showing blastoporphyritic texture. It is a katamorphic product 

 of a porphyritic igneous rock. The schist is covered by red 



1) K ^ ißi 2) See page 68. 3) ^ ^ See page 71. 



