ON THE SO-CALLED CRYSTALLINE SCHISTS OF CHICHIBU. 79 



limited area, still the building materials of its geologic edifice are, to 

 the writer's view, those compo«ing nearly all the systems that 

 occur elsewhere in Japan, and therefore the earth's history of 

 Chichibu may indeed serve as a type of our geologic formatiom>. 

 Mr. Ötsuka, a graduate of our university, took up, at the writer's 

 request, the district in question for the subject of his thesis, m order 

 to explore thoroughly its geognostic condition. As the result of his 

 study in field and laboratory, he has eventually succeeded in recogniz- 

 ing a certain regular order of sequence of strata younger than the so- 

 called crvstalline schists. From various observations taken as far as 

 possible at différent points of the Chichibu mountains by the Avriter 

 and Mr. Otsuka, and from the data ascertained by Mr. Otsiika,^) 

 with which the writer's scheme is also incorporated, the latter chiefiy 

 referring to the ? pre- Carboniferous and Sambagawan series, we were 

 eventually enabled to recognize the following stratigraphie order of 

 rock series, counting from the very lowest that is ever developed in 

 this region ; it must at the same time be remarked that the names of 

 fossils here given should Ije taken with reserve, and considered as 

 only of an approximate value, as we can not pretend to any thing 

 more than this at the present state of our knowledge : — 



(Compare Diagrain I. page 78.) 



' 1 Xormal sericite-schist together with the piedmontite-schist 

 in its upper horizon. 



2 Green, and black spotted schist. 



3 Lamellar epidote-sericite-gneiss. 

 •i Amphibole-pyroxene schist, })yroxene-amphibole schist, 



pyroxene-epidote, and amphibole-epidote schist, together 

 with serpentines, gabbros and the gabbro-diorites. 



ce 



C3 03 



1) On the Geology of the Mountain-districts in Chichibu and Kanra, 1887. (Manuscript^. 



