40 ART. 1.— B. KOTO: 



but many of these often have slowly undulating folds. Perhaps it 

 will be convenient for descriptive purposes to group the fault-ridges 

 into two series — the lengtluvise and crossivise ridges. In the following 

 I shall select and characterize a few of the principal ones. 



There are about seven lengtluvise ridges and an equal number of 

 crosswise ones. Counting from the south we have in the south group 

 of the latter series the following : — ■ 



a) Crosswise Series. 



South. Group. 



i. The Syu-yang-san Ridge. — In the southern Hoang-häi Do we 

 meet with this ridge with the scarp on the south, which starts from 

 Syu-yang-san 1 } near Hai-jyu 2) and reaches Chhi-ak-san 3) of Päik- 

 chhyön. 4) The ridge of gneiss-granite is clearly seen from the south 

 const, and passes through Syong-ak-san 5) of Syong-do. 6) I have 

 crossed it near Sang-nyong 7j at the Im-jin Gang. R) 



ii. The Myör-dk-san Ridge. — This ridge forms the axis of Hoang- 

 häi Do with the scarp in the contrary direction, i.e. toward the north. 

 Probably coming from Shan-tung, it enters the peninsula at Chyang- 

 san-kot and is prolonged to MyÖr-ak-san 9) in Syo-heung, 10) terminat- 

 ing at the brink of the trench of Chyuk-ka-ryong at Ko-am-san, n) 

 west of PhyÖng-gang. 13 -' An easy road leads from the latter to 

 Phyöng-san 13J on the south side of the ridge. 



iii. The Chyo-il-lyöng Ridge. — This ridge begins from a slate 

 elevation between Hoang-jyu ll) and Chyung-hoa, 15 > and passes with a 



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