82 B. KOTO 



the so-called crystalline schists^) are fully exposed to view, and the 

 study of their geognostic condition forms the subject of the present 

 paper. The following gives only a compendium of the writer's notes, 

 and from the nature of the circumstances, much more cannot he 

 expected. 



The writer now proposes to treat the subject in the following 

 order : 



A.— Petrography of the Sambagawan series. 



(rt) General remarks. 



{h) The lower division or the normal sericite-schist. 



(c) The middle division or the spotted graphite-schist, and 

 spotted chlorite-amphibolite- schist. 



(d) The upper division or epidote-sericite-gneiss. 



B.— Architectonics of the Sambagawan series. 



(e) General remarks. 



(/) The Lower Sand^agawan. 



(g) The Middle Sambagawan. 



( // ) The Upper Sambagawan . 



( I ) Profiles. 



(_/') Relation of the topography and geology of the Samba- 

 gawan terrain. 



(/,•) Massive rocks. 



C.— Conclusion. 



1) It should be here expressly remarked that, when speaking of cn/.-^tiillinc sc]iists of 

 Ohichibu in the present paper, the writer takes them only in the petrographical sense, and 

 does not necessarily imply those of the Archaean group. 



