JOURNEYS THROUGH KOREA. 117 



II. The Basin of the Upper KYONG-SANG Formation, 

 or the NO-RYÖNG Ridge Area 



a) Froin Mu-an to Chyong-eup 

 (See sketch-map, p. 113.) 



In the preceding descriptive profile from Chßn-jyu to Nam- 

 uön, we crossed the No-rf/ong ridge between Im-sll and Sö-uön at 

 the Man-mal-koan pass. That part of the section consists of 

 conglomerate, black marl, and light-colored tnffite, corresponding 

 to the " Marl Series " of the Upper Kißng-sang Formation, and 

 runs across the spade-shaped basin of the said formation now 

 risino- as a distinct rid^e throno;h differential erosion in south-west 

 Korea. 



In order to arrive at some definite idea as to the extent, the 

 tectonic condition, and the reciprocal relation of the said complex 

 to the surrounding formations, I shall start fi'om the south-west 

 end of this s pa tula te area. I myself have not been in this 

 region, and what I give in the following is a composite picture 

 drawn after inspection of the field sketches and rock- specimens 

 placed at my disposal by Mr. Yabe. 



In my second traverse from the treaty port of Mok-pho to 

 Ma-au, I have already spoken of a foliaceous graphite- sericite- 

 schist'^ with the strike N.E.— S.W., and the dip S.E. at the 

 latter locality. The Mesozoic mefcamorphic schist is underlaid con- 

 formably by a sericite-quartz- schist at Ham-phfông'^. Mr. Niiyama 

 went due north to Yöng-goang^^, finding on the way a tongue of 

 green breccia of felsophyre on the gneiss -granite ; but Mr. Yabe 

 took a northeasterly route from Ham-phj'6ng to Chyang-söng *^ 



1) See page 70. 2) WL ^ ^) M ^ 4) ë ëc 



