156 ART. 2. — B. KOTO : 



tatiiig grains (0.1-0.34 mm) of clear quartz with a few lamellae 

 tf liglit-lorowiiisli sericite wliicli imparts an imperfect scliistosity 

 U) the re civ. Thrcngli the scarcity of micaceous mineral, the 

 rock actually graduates into a quartz-schist. In general appear- 

 ance it is like the well-known itacolumite. Ours, however, is not 

 elastic. It is a sericite-quartz-schist of sedimentary origin. 

 The bed occurs in a regular belt 40 Lm long, extending in a 

 northeasterly direction from the Tal-dun '^ headland at the south- 

 west corner of the peninsula through Kaiui-jiiv^ as far as Neimg- 

 jyi(''\Y>. 50) and forming a steep syncline. 



Southeast of Neung-jyu, the belt is directly overlaid by a 

 gray m_etamorphic tuff- sandstone, which in turn is covered by a 

 brownish felsophyre (p. 50 [3] ). This find was of uncommon 

 interest, for from their position I was enabled to judge their 

 relative age. Between this series and the preceding para-gneiss, 

 there must have been a time gap, as they, so far as my experi- 

 ence ooes, never occur in association. The series, next above, 

 the metamorphic Mesozoic, consisting of various metamorphics of 

 tuffs and effusives of the character of sericite- schist, approximately 

 corresponds to Inouye's Kwi-san Formation'^. It is worthy of 

 note that the Kang-jin sdmf and the one next to it, though not 

 usually occurring in association, have a geological position which 

 makes it appear as if they had been pinched l)etweeu the my- 

 lonitized and compressed eruptive gneiss. 



In its northward course the belt of the Kang-jin schist dis- 

 {»ppearing under the Phyllite Formation emerges farther north- 

 wards both on the south and the north of OL'-koa, and extends 



1) :^ ïH * â '-i) m V*: 3) m m 



4) JMem. Geol. Sun: Jiipau. Vul. I., No. 1. piige 20, l'J07, Tokyo 



