ON THE So-called crystalline schists of chichibu. 11.^ 



a. — The normal sericite-schist rich in quartz, abundant in pistacite- 



patches, the colour light-gray ; 

 />, and b'. — the purplish-red piedmontite-schist, only one inch in thickness; 

 c. — the white, compact quartz-schist making up very thin zones ; 

 (l^ — the green chlorite-amphibole-schist with its characteristic white 



"eyes" of felspar; the rock rather compact and imperfectly schistose; 



yellow, glittering iron-joyrites abundant ; 

 e. — the graphite-sericite-schist with black specks of felspar, showing a 



thin lamellar structure; spots very promiscuous through weathering; 



the rock earthy ; the soil produced therefrom black and slippery. 



The above diagram illustrates well the junction of the Middle 

 and Lower Sambagawan. The cliiï about 7 m. in height standing 

 in the foreground represents the latter, while the ]:)lar'k graphite- 

 schist of the former lies a little behind covered with grass and conse- 

 quently not shown distinctly on the drawing. The overlying as 

 well as the underlying Sambagawan rocks dip away from the sight of 

 the observer. 



3. — Again about 6 km. up the Arakawa other outcrops come to 

 view at the village of Hon-nogami, and also close by the side of 

 the bridge in Minano. In the latter place two thin zones of 

 piedmontite-schist alternating with the chlorite-amphibolite have 

 been observed in an almost horizontal position with a slight dip to 

 the north-east, just as at Sueno already mentioned. 



The occurrence of the red epidote-schist in Hon-nogami, and 

 Minano may be ascribed to the existence of a fault running 

 through the two villages from Kanasaki in the direction of iSr.20°E 

 along the left side of the Arakawa The vertical displacement 

 being very small, the outcrops found there are very meagre and the 

 underlying normal sericite-schist does not show on the surface to its 

 full advantage. The strike runs approximately N.-S. with a slight 

 dip to the east. 



