92 A.RT. 2. — B. KOTO : 



tlie eumnai of Y'ông-clihu'ôn^^ in a depression of the Shale 

 terrane with the strike N.S. and the dip 20" E. The same 

 series, occasionally interstratified with sandstone layers was ob- 

 served from the thriving eumnai for a distance of 12 Inn becom- 

 ing almost horizontal as we went up eastwards along a fork of 

 the river to the village of Chliij'ông-gij'ônfi'^ and the pass of the 

 same name (150 m). 



Here a greenish, banded ilinty tnffite made its appearance, 

 and its gravel, bronglit down from Ok-san, was being worked for 

 gold. This also is the marl gold. 



A greenish hornstone-like rock occnrs constantly on the npper 

 horizon of the black Marl or Shale belt from Chin-lml '^^ via Chhyang- 

 nn'ciuj ^^ liither, and we shall see it extensively developed in the 

 environs of Kycng-jyu. The east foot of tlie pass is on the liorn- 

 blende-biotite-granite which appears for only a short distance intrud- 

 ing into flinty rock as if producing a contact effect on the latter. The 

 Chhycng-ggcng pass, though not very high, is one of the most import- 

 ant topographic elements of the Ihl-jmlk-san range ''^ and is the second 

 (inner) coastal ridge of Kgcng-sang-Do along the Sea of Japan. 



From the N'o-sll chgumak at the foot of the pass to An-gang "■ 

 (90 m) we went over a Ijarren gravel flat (PI. XX. ßg. 3, and PI. 

 XXI. fig. 1) of flinty rock, seeing on tlie north a cliff of the 

 same rock with a westerly inclination. Beyond the hills at a 

 distance of 10 hn in the same direction runs the high untrodden 

 ridge of To-eiim-scm, which is probably a prolongation of Iloa-san '^ 



1) fk J'l From liere Mr. Yabé took the direct route to the south-east toward the old 

 caiiital Kyöng-jyu, finding on the way the black marl sandstone series, and at Sam-kori a 

 granitic rock, and further on the banded flinty tutHte as far as Kyöng-jyn where, however, a 

 bill of aplitic masanite was seen on the west of the eumnai. PI. XX. ß(j. 2. 



'^) ^ M: 3) See page 27. 4) See page 88. 



5) See Geotectonio Map in ' Orograiihic Sketch of Korea.' I'his Journal, Vol. XIX. 



Art. 1. G) ^ ^ 7) See page 71. 



