ON THE SO-CALLED CRYSTALLINE SCHISTS OF CHICHIBU. 119 



in the riglit, basing this belief un the general dissimilarity of p3tro- 

 graphical characters of the two divisions. Other evidences in f ivour 

 of his view could be produced from observations made in the Island 

 of Sikoku if required, but the future will decide the whole question. 



The task becomes still more serious when we try to fix the 

 boundary between this and the Mikabu series, as the appearances of 

 the rocks of both groups are in the main similar ; still the micro- 

 scope affords a means of discrimination. 



The typical exposure of this division may been seen on the 

 Kainita pass between Kaiya and ]\Iisawa, where the strata lie nearly 

 horizontal with a slight dip to the east, and the serpentine dykes 

 variously traverse the rocks without causing any considerable dis- 

 turbances in the adjoining gneiss, and the latter is [»artially covered 

 by the pyroxenite and amphibolite of the Ogiri-yamn. Where the 

 Upper division fails, the spotted graphite schist of the Middle Samba- 

 gawan is directly overlaid by the Mikabu series. These conditions 

 are clearly shown in the following profiles. 



(i) Profiles. 



Profile I, C D — is taken from Kaiya to Misawa for a distance of 

 about 4 km. through the well-known pass of Kainita ; the rocks 

 exposed are in the main various types of the epidote-sericite-gneiss, 

 i. e. the Upper Sambagawan. Just at the foot of the pass near 

 Kaiya, a red schalstein accompanied by a siliceous slate rests uncon- 

 formably upon the gneiss. This gneiss has a thin-lamellar structure 

 and may be easily cleaved into stiff papery masses. The w^eathered 

 rock presents a talcose appearance. Half-way up it is covered by 

 a diabase-amphibolite which in turn is intruded into by dykes of a 

 bluish-green serpentine having a shelly structure. On the western 



