104 ART. 2.— r.. KOTO: 



After about 4 hii, we reached CJii-thong (40 ni) wliere the 

 granitic masanite mountain protrudes into the red formation, the 

 latter being soon replaced b}' the overlying green -tuf fite (the 

 strike N.E. — S.W., the dip S.E.) which continues to appear on 

 the gravelly Hat opening eastwards to Nam-chhang and the coast. 



Following the stream up to S'ô-chhang (IG A??! from the river), 

 we saw on our left (PL XXIV. fig. 2) the massive Tai-hoa-san ^^ 

 consisting of green breccia and sheet of porphyrite. This is the 

 uppermost Kgong-scmg formation and the one which the stratigra- 

 pliical succession hitherto traced had led me to expect. Magnetite 

 is reported to occur in the mountain. It is said that it is also 

 found at Ung-goI''\ lying a few kilometers to the northwest of 

 S'ô-chhang, where the ore-body seems to occur in the green breccia 

 near the masanite basement. It may be of tlie same type as 

 that of Fiisan ^\ To the right (PI. XXIV. fig. 2) runs a porpliyrite 

 ridge which begins at Kyong-jgu and ends at the port of Fusan. 

 It is the inner Tal-päik-san ridge. 



The road ascends two successive terraces (PI. XXIV. //r/. 2) of 

 porphyrite gravel. This was the second time that I had seen this type 

 of land-feature in Kgöng-sang-Do ; the first instance I have already 

 mentioned as occurring east of Kyong-jgu ^\ Both are indications of 

 the gradual upheaval of the east coast. Thence the path des- 

 cends southwards over masanite which crops out from beneath the 

 sheet of porphyrite. The edge of the Hoang-dari declivity is in an- 

 other respect significant, for it is the 'fault-scarp' ^^ that runs equatori- 

 ally from the north of Masan-plio via the Mul-geun gorge of the iVa/t- 

 tong-gang to the east coast. On the south of the fault, the mountains 



3) See unie, page 11. 4) See ante, page 98. 

 5) See pages 16 ami 131:. 



