216 ß- KOTÖ. 



lenticular nodules of a dioritic habitus, j)i-oduced by differential move- 

 ment of a granitic magma,, di[) with tlieir longer axis towards the 

 same point. The complex of amj)hib()lite and mica-schist has also 

 th(i dip in the same direction ; but it is sharply separated from the 

 other by a nearly perpendicular line of fault, which seems to continue 

 soutiiwards for a lono- distance, with the bearin«- J^. 30 E. 



From what has been said, it is evident that the granite and 

 schists are geologically different bodies, brought to their present situa- 

 tion side by side by a down-thrust of the schistose member, and they 

 are hi/ no means structural phases of one irruptive stock. Although the 

 secti(jn now examined seems at first sight (piite insignificant, and 

 to have no bearing of geological importance, nevertheless -it has 

 been of great use to me, by showing clearly the two sets of rocks 

 to be of heterogeneous origin. Some gneisses and amphibolites 

 approach in tlieir outward aspect to the schistose modification of 

 granites, aiid ('ouibunding tliem together is very liable to occur during 

 field-work. Tiiis in itself is to a certain extent reascjnably allow- 

 able, but it would be a gross error to c<)nsider tlie two kinds of rocks as 

 different phases of primarily only one species of rock. For some distance 

 to the west, tlie same schistose granite with streaky nodules continues 

 to ap[)ear along the road as far a.-s Ishikawa, where it gradually passes 

 into a, norma] granular variety, containing likewise blackish nodules of 

 a nu)re or less dioritic habitus. We see here a number of reddish, 

 fine-grained pegmatophyre dykes (d), lainning N, 80° F. with N. \V. dip. 



The last line of secticm ((x-11) that will be examined is drawn from 

 Ishikawa, to Shimo-Ivawabe on the right bank of the Abukuma-gawa. 

 This traverses the region from S. E. to N. W., and stretches for 

 about 6 km. Tlie chief interest attaching to tlie present section is not, 

 however, in the bedded formations of the series, but in the irruptive 

 rocks wliich, mixing with e;ich otlier, cause a very complicated tectonic 



