282 



B. KOTO. 



hitherto none could find the way of enoape. The present writer 

 endenATjnrs to decipher, in snhseqnent p;\ii'es, the com]ilicnted mode 

 of arranii'eraent of these ancient complexes, and the stratigra])lnr';d 

 order of the schists of winch the archœan is C(^mposed. 



The srhisto>ii' vnriety — the o-neissose g-ranite — ,occnrring in connec- 

 tion with the h()rid)lende-,iiTaiiite, and forming a p;u't of one and Hie 

 same mass, is only a dvnanio-metamor])hic facies, hnt bronght about 

 under special conditions. The stowings, foldings, and faultings of the 

 masses of rocks, so common (bu'ing a mountain-building, have occurred 

 in the Abukuma plateau only ar tlie marginal zones ; while the 

 portion, of which the central height is formed, has remained quite 

 intact. There has lieen ])roduced a differential movement, leaving 

 tVie interior as a staiubng l»lock, called geologically the Har.^l, tlie cast 

 niid west sides of the plateau being thrown down to a lower lc\el, 

 alono- the meridional dislocation-lines. 



Pacific. 



% ABUKUMA PLATEAU. 



\ \ 



Llcal profile of the Aliukuiua plateau. 



I liad frequent occasi(Mis tf. (»1 serve, during my short \isit, 

 occiuTenccs of the scliistose variety (gn) alc^ng the Pacific const, and 

 also along the Abukuma-gawa, while the height lying between them 

 is occupied by a normal, typically granular gi-anite. I shall come 

 again to the same subject, when speaking of the geotectonic condition. 



G 



