40 ART. 2.— B. KOTÔ: 



or left as an outstanding block, — the hon^t behind the surround- 

 ing lowland which was thrown down to a lower level. The 

 hornblende-orthogneiss '^ on the ascent and top (PL IV. fig. 2) 

 already referred to, was intrusive into the present rock, and com- 

 pressed and sheared together into its gneissoid form. We had here 

 before our eyes the marginal sheared zone of a large geologic body 

 constrained and deformed by combined processes of mechanical, 

 hydrochemical, and crystallizing forces during mountain-building. 

 We were to meet wûth the counterpart of the shear zone on the 

 western margin of this massive on the Posong • Sachhang- Pongnai- 

 jyaiig line. I had given many years before a description of a 

 similar phenomenon on the diagonal horst of the Ahulmma upland "'''* 

 in North Japan. 



We next came down to Pöl-tög-göri''^ and Holng-ho ^\ and ^vent 

 up the low but steep pass of the Kong-völ-cJihi^\ Just at its foot, 

 an ege-giieiss cropped out witli white microcline crystals 2-4 cm in 

 size. Up to the top and farther on, it became, however, a finer 

 ci/e-gneiss "^ finely banded, dipping 5" eastwards to tlie So-cliJti 

 pass when again the very coarse white eye-gneiss was seen on 

 tlie road to Ha-dong, witli extraordinarily large eyes (up to Son) 

 of orthoclase. Brownish-red almandine was observed as an ac- 

 cessory. I have never seen or lieard of any such gicmt-cpiem- 



1) See page 38, footnote 3. 



2) This Journal. "On the Archiean Formation of the Ahukuma riateau." Voh V. ji. 197 

 et seq. 



3) fë M Ë ffi 4) 1^ fi b) ^ fl ù.f 



fi) The rock is the " Augemiranulüe" with a few eyes (1 cm) of diiU whitish microcHne. 

 The color is light-brcwn with flowage stripes. Microscopically, it consists of quartz, microcline 

 and plagioi-lase, all exhibiting vindnlatory extinctions, and forming a cataclastic-granular aggregate. 

 Apatite is tolerably abundant. The microcline contains vermicular cpiartz. Shreds of biotite, 

 much fibrillated, are strewn in schistose directions. The rock probably represents a marginal 

 phase of the coarse eye-gneiss of Ha-dong, which had been subjected to the influence of the 

 injection-flow after a nearly perfect consolidation of the granite-magma. 



