JOURNEYS THROUGH KOREA. 97 



colored tuffite earth wliicli is underlaid by a nevaditic -looking 

 whitish crystal-porphyry ^\ It was probabl}' this eruptive which 

 supplied tlio material for the cream -colored tuffite. I took 

 some powder of the latter, boiled it witli HCl, and decanted the 

 decoction. The insoluble part was examined, and seen to consist 

 of particles of a half- decomposed felsitic groundmass of felsophyre. 

 It is tlierefore not mud nor clay but silt that builds up the tuffite. 

 It is also not one of those pumiceons tuffs which we, living in a 

 volcanic countrv, are accustomed to see, and for which it miffht 

 readily be mistaken. The Korean rocks as compared with ours 

 must produce rich soils, when decomposed. 



From Y'ông-ll southwards along tlie coast, tlie country is 

 thinly populated, and especially from CJn/ang-gl on it is by no 

 means easy to find an inn for a night's lodging. The naked hilly 

 coastal tract of whitish felsophyre and masanite, and yellowisli 

 tuffite, is fast falhng into disintegration, shallow valleys being 

 filled up and changed into sandy wastes ; and highly sculptured 

 talus slopes are constantly sending down masses of débris from 

 all sides like miniature glaciers. The country presents truly tlie 

 " bad lands " scenery (PL XXII. ßg. 3). 



The west side is a ridge of hard rocks, to which I first 

 turned my steps (see Jig. 3) to reach Kyöng-jyu via the Kana-chJii 

 (375 m) from the poor village of Oa-eup "^ (20 m). Near the 



1) The rodv from the Kanichhi (The Persimmon ]3ass) is a light-gray, slightly violet rock 

 varying in structure from felsophyric to nevaditic. The iDorphyritic components are em- 

 bayed qimrtz and idiomorphic feldspars, both twinned and untwinned. The nevaditic variety 

 contains some light-brov/nish green hornblende, and rectangular aggregates of biotite as if it 

 were a pseudoniorph after the former mineral. The groundmass varies from the microfelsitic 

 with fluctuation-structure (felsophyre) to the imiilication-structure cf quartz and orthoclase 

 (nevaditic masanite). Apatite is present abundantly as an accessory. 



2) G)V E. '^h-fi dry river bed, which we followed hither, here turns eastward, and is said to 

 end at Ku-gil (jl'b) oh C(jast. The monastery of Chirira-s;i (iiiJt tfv '^ï") i« 2 A-?)i west from here. 



