JOURNEYS THEOUGH KOREA. 73 



to S.S.E. with the dip N.E. The hill-riclge whose lowest neck we 

 had just passed over runs in the same direction, separating on 

 the west tlie small flat we had crossed from the eastern one we 

 had still to go through. The geological formation was the same 

 as that which we had seen from Häi-nam to Mok-pJio throughout 

 the headland of U-su-yöng (pp. 57-63) ; hence, it is the Upper 

 Kymg-sang formation. 



It is worthy of note that we here met with a new tectonic 

 element, — the strike direction from the northwest to the southeast — 

 running at right- angles to the prevailing direction in Chyöl-la-Do. 

 The same element had already been observed in the headland of 

 U-si(,-yöng and in the Island of Chln-do^'^ 



From Komang-gol we proceeded eastwards on denuded reddish 

 hills of the same complex, viewing toward the northwest the 

 mountains of the No-rg'ông sgsfem with the N.E. — S.W. trend. 

 Our route lay on a desolate monotonous tract of Diluvium-like '^ 

 elevation thinly covered with dwarf pine trees. 



Finally, we crossed a small tributary of tlio Y'ong-san-gang 

 river at Chho-dong^\ full of gravel (PI. XI. ßg. 1) of claystone- 

 porphyry, greenish porphyrite, and their derivatives. The view 

 opens towards the south, and in the distance the snow-covered 

 Uöl-chhi/iU-san^^ of Yöng-am was seen towering beyond the Yöng- 

 san-gang and having^ an east-west trend and a northern 

 precipice. 



Proceeding towards Na-jgii, we next crossed a low mountain- 

 ridge, 4 hn in breadth, consisting of felsophyres, one silicified and 

 reddish, the other decomposed and greenish. Daring our descent 



1) See page G2. 



2) Diluvium is rarely met with in Korea. 



3) ;^ jl^ 4) See ante, i^age G5. 



