JOURNEYS THROUGH KOREA. 155 



clase and quartz, the last but one in tlie form of plates in which 

 rounded quartz is enclosed in the poikilitic fashion. The rock is, 

 therefore properly speaking, a mefagneiss or Injectioii-gneiss. 



The Pong-göi ^^ gneiss resembles to all appearances the Lower 

 Takaniiki gneiss"^ of Nortli Japan, a part of tlie " Kashio gneiss " 

 of the Japanese Geological Survey. Like its Japanese equivalent, 

 this gneiss, though not in the normal condition, represents the 

 basement sedi-gneiss of the peninsula, pressed up and intruded 

 by the granodioritic differentiation- magma of the granitic batholith 

 of the Chiri-san massif. 



I. b. The second occurrence of the true sedi-gneiss of the 

 character of the Takanuki series is that of the west side of the 

 Chiri-san massif, lying between Na-jyu and Yöng-am ■^\ near the 

 gold placer of Tong-cJiJuuig. The Tong-chhang gneiss is exposed in 

 a narrow band extending from the northeast to the southwest. 

 This small Archaean patch lies on the edge of the schistose granite 

 terrane, as if it were swimming on the granitic batholith, and 

 on the south it is intruded and covered by the quartz- tsingtauite 

 with a few plagioclase phenocrysts. The sediment-gneiss is a 

 light-yellowish, hne-psammitic biotite-gneiss with parallel-planed 

 structure. 



II. The Kang-jin Mica- schist 



IL a. Next in the ascending stratigraphie order, though 

 never occurring in direct contact with the preceding, comes the 

 para- mica -schist. It is a wliite, tabular, blastopsammitic, 

 fine-saccharoidal schist consisting of angular and partly interdigi- 



1) M îi 



2) 'The Archean Formation of the Abulmma Plateau,' p. 24:5. This Journal, Vol. V. 

 PI. ni. 3) See page 65. 



