204 



B. KOTO. 



moinlicr of the iip|)cr Arolia^nn ^Toiip of Jnpnn. Spocinl fler-icri|itioiis 

 oC nicse rocks arc ^'iveii in an<~)ther fliaptcr. 



As may be cle:ir]v nndcrstood from the profile, the wli(^le of 

 tlie Takamiki series is piiiclied in between ]iornl)]en(le-g-raMite, and this 

 iact serves as an examj)]e of iindonbtedJv irrtiptive granite, liaving 

 literally taken np with it a ]:)art of tlie crust of the eai-th in its bosom, 

 whatevei- may liave l)een the nature of the irruption, whether passive 

 or active. 



As tlie schists are flaiiked on botli sides 1w irruptive matter, nnd as 

 all dip at very high angles, we can roughl)^ estimate tlie lireadtli of the 

 lower meviher of the Takanuki to l)e 5 km. We do not here take into 

 account the thickness of the upper member, i. e., the titanite-amphi- 

 bolite (l^ T A), which makes up ordy an insignificant part of the 

 section. 



At Yania-no-Ogawa the gabln'o-diorite (d ]>) again makes its 

 appearance as a large boss. From here to the village of Knwakami, 

 we find nothing l)ut the hornlJende-granite (IT U), variously intruded 

 iiito by the younger biotite-gi-anite (B G) and pegmatopliyritic dykes 

 (ciy jS^ear the last-mentioned village, the hornl)lende-granite assumes 

 a gneissose structure (G H G) with the strike north' and south. 



The second line of section selected, C-I) in Plate XXA , is one 

 drawn westwards from Kadöno, 12 km. west of Taira, across the 

 ridge of Goz;dsho to the west of Taktmuki. This is the best ])rofiIe 

 one can get of the whole region, -as the line goes approximately across 

 the strike of the complex, which embraces nearly the complete series 

 of the Arclitean rocks to be studied, excepting the upper horizon of 

 the Takanuki series. It is interesting chiefly as showing the strati- 

 graphic relation in a clear manner in favourable exposures found along 

 the transverse valley througli which the brawling SauKÎ-gawa makes 

 its course ; and one of the wavs of coiiimiuiication acr^-^s tlie ])la,teau 



