JOURNEYS THROUGH KOREA. 153 



maps. A southwest brancli (the Am-nok-jln '■*) of the Söm-Jin-gang 

 and the corresponding tributary (the Nam-gang of Chln-jyu) of the 

 Nalx-tong-gaiig rise near the south coast, but instead of flowing 

 directly to the sea they take north-easterly courses and make 

 roundabout ways to their debouchures. This I consider to be 

 the unique feature of the drainage and topography of 

 South Korea. 



C. liECAPlTULATIOX OF THE GEOLOGICAL JFOHMATIONS 



Having thus described my Tlu'ee Traverses across regions wdtli 

 extremely favorable exposures of rock series, I shall now give a 

 general survey of the geological formations according to their suc- 

 cessive ao^es beo;inning with the oldest in tlie following order :— 



I. Basal gneiss . 



II. IvaDg-jiii mica-schist 



\k 



III. Phyllite schist 



(Metamorphic Mesozoic) 



lY. Great granitoid series-{?> 



.c, 

 ^a 



V. Ivyüng-sang formation^'' 



(Mesozoic) 



(«. The Pong-göi gneiss. 

 [/>. The Tong-chhang gneiss. 



The Kang-jiu mica-schist. 



The Mul-kö-sil mica-schist. 

 a. The Tong-pok complex. 

 h. The Mvi-au complex. 

 c. The Chyön-jyu complex. 

 (/. The Knn-san complex. 

 o. Palfeogranite. 



Melauocrate. 



Lencocrate. 



The Lower. 



The Upper. 



The Kyong-sang formation and 



its Japanese equivalent. 



1) 11 m W- 



