JOUENEYS THROUGH KOEEA. 119 



place northwards are found, (3) greenish amygdaloidal rock, (4) 

 compact dark-gray diabase- aplumite with phenocrysts of hornblende 

 surrounded by a resorption-border and h'ght-brown augite (the 

 groundmass has interstitial colorless glass), (5) thick grayish, 

 non- calcareous shale with plant-remains, and (6) greenish, finely- 

 granular, aphanitic diopside-porphijrite. Further northwards we 

 meet with (7) a brownish fusion-breccia, (8) coarse, sheared 

 granite, (9) a fine modification of the same, and lastly, (10) a two- 

 mica-bearing ortho-gneiss which is scaly and imperfectly schis- 

 tose, with apatite and tourmaline. At the well-known No-rgöng ^' 

 pass there occurs a grajdsh porphyritic rock with rectangular 

 plagioclase, 7 mm in size, having quartz grains in the microgranitic 

 groundmass with approximately rectangular orthoclase. It is a 

 porphyritic masanite. Numbers 1-7 should be included in the 

 Kyong-sang bed. 



The country suddenly opens northwards from the No-ryöng 

 pass toward Chyong-eiip and the plain of Chy'6n-jyu through foot- 

 hills of orthogneiss. The gradual ascent through the Kyong-sang 

 terrane and the sudden descent beyond on the orthogneiss region 

 are the characteristic features of the " spatulate area " of the 

 No-rycng ridge. 



Not much light has been thrown on the local geology since 

 Gottsche's visit. From its lithological characters I am disposed to 

 think the bed of Chyang-söng to be the equivalent of the " black 

 series " of the Upper Kyong-sang formation, i.e., post- Jurassic. 

 As to the relation of the complex developed here and that of the 

 green breccia of Komang-gol'\ lying a little further south, I 

 consider them contemporaneous in a broad sense, representing 



i) M. ^ 2) See page 72. 



