ON THE SO-CALLED CRYSTALLINE SCHISTS OF CHICHIBU. 135 



Sambagawan series may, no rloubt, be correlated with some of these 

 European types ; it is, therefore, liy no means safe to give it now a 

 final resting place in the Archaîan group, as has been already done 

 by E. Naumann. 



In 1885, Dr. E. Naumann, then Director of the Geological Sur- 

 vey of Japan, laid before the International Geological Congress in 

 Berlin, a reconnoissance-map of the geology of Japan, in which the 

 so-called crystalline-schist system seems to cover a considerable part 

 of the map. But this must now^ be modified, as the season's works of 

 last year in the Island of Sikoku, and in Chichibu have proved that 

 the greater part of the so-called Archi^an rocks in Japan is really 

 represented by the Sambagawan series. 



As already mentioned, the age of the Sambagawan series is 

 still uncertain ; therefore it is advisable at present to give it a special 

 position in the cartographical representation of the geology of Japan. 

 AVitli these remarks based upon microscopic and tectonic investiga- 

 tion, the writer concludes now the sketch of the Sambag-awan series 

 of Chichibu, liy which he hopes to give some impulses to, and some 

 bases for, further observations and studies. 



I take here the opportunity of expressing my hearty tlianks to 

 Professors Dairoku Kikuchi and C. G. Knott for their kindness in 

 undertaking a laborious and time-wasting work to see the paper 

 through the press, and also in giving many valuable suggestions and 

 additions. I am also largely indebted to Messrs. S. Sekino, M. 

 Okawa, and H. Hirauchi for the preparation of the annexed plates. 

 My thanks are lastly due to the Geological Survey of Japan for the 

 free use of the topographical map. 



