ON THE SO-CALLED CRYSTALLINE SCHISTS OF CHICHIBU. 121 



into the mode of aiTaiigemeiit, und tli3 relation« oï various rock-types 

 which insensibly ]):iss into one nnotln'r. Xear the middle of the jn'ofile 

 at Terayama (Köchi), a serpentine dyke is found considerably disturb- 

 ing the graphite-schist; at Köchi an antielinal fold is clearly traceable. 

 Before the anticlinal the strike is X. 80° W. with the dip of X'E ; but 

 afterwards it changes to X. 10° E. with ihe south-easterly dip. 



Profile IV, IK — is that (-f the Samba-gawa, along which nil 

 the three divisions are typically represented, \u the lower course 

 of the river îdrernate layers of the spotted black and green schists 

 have a slight northerly dip, while at Siosawa, the strike changes to 

 N. 65° W., dip X.E. The piedmontite-schist layer has strike X. 65° E., 

 dip S.W. All the layers are in the same condition up to Imogaya. 

 After crossing the top to the Hino valley, the strike of the Upper 

 Sambagawan becomes X.-S. with dij) to the west. 



Profile V, LM — is taken along the Ogawa in Akihata for a 

 distance of 8 km. (2 ris). The rocks exposed are mainly of the 

 Middle division with str. X.oO°\Y., dipping gradually to S.AV. X'ear 

 the Kotöge in Hino, the black schist is traversed by serpentine-dykes, 

 and higher up we encounter the Mikabu rocks which continue far 

 into the interior of the Sanchü valley on the south. 



At the north end of the profile (Todoroki), the piedmontite-rock 

 crops out to day-light but only for a short distance, and then again 

 disappears under the Tertiary sandstone of the Chogonji-yama 

 (str. W. 10° X ; dip high to XE.) 



Profile \i, AB — represents the section for a distance of 2 km. 

 from Kamagata on the south-east to Ogawa on the north-west. 

 Many instructive exposures may be observed along the winding- 

 course of the Tsuki-gawa where the Lower Sambagawan Avith the 

 normal sericite-schist and piedmontite-schist is conformably overlaid 

 by the Middle Sambagawan complex of the spotted green and spotted 



