114 



B. KOTO 



conspicuously visible in small patches on the plane of schistosity of the 

 rock and characteristically rich in microscopic rutile. 



2. — About 4 km. west of Yorii, which is 12 km. south-west 

 from the station of Fukaya on the Nakasendö raihvay, other good 

 outcrops may be seen in Sueno and Kanaya along the Arakakawa ; 

 these exposures are easily accessible to observers as the two villages 

 lie on the main road leading from the Musasi plain to the centre 

 of the Chichibu district. In a stone-quarry in Saeno on the right 

 bank of the river, the normal sericite-schist with abundant lamellre 

 of a liofht-ofreenish sericite is worked in thin slabs, into which the 

 schist may be readily cleaved ; the strike is nearly E. 20° S. with high 

 angles of dips to the S. E., and the schist is c(3nformably overlaid 

 by the spotted graphite-schist. Here lies the anticlinal saddle of the 

 Sambagawan series ; for, at the Kanao bridge (Tokura bridge), only 

 1 km. to the north of the quarry already referred to the piedmontite- 

 schist zone is found with its accompanying normal sericite schist, having 

 the strike N. 30° W., but the dip being 40° N. E. Diagram II show^s 

 an illustrative exposure near the bridge already mentioned : — 



Diagram II. 



