ON THE SO-CALLED CRYSTALLINE SCHISTS OF CHICHIBU. • 83 



A. Petrography of the Crystalline Schists. 



(The Sambagawan Series.) 



(a) General Remarks. 



However simple and monotonous the structure may appear when 

 we travel through a territory of schists, still there are sufficient diver- 

 sities to be seen even l)y a casual observer. It is to be deeply re- 

 gretted that crystalline schists have been regarded with utter indif- 

 ference by our geologists, so that they have been mapped barely as 

 such and taken heed of no more ; but in reality, these old schists 

 can tell more of the history of the past than others, although the 

 events lie hidden by the veil of time. Dissimilarity in structure, in 

 colour, and the fluctuation of relative quantities of mineral components 

 are sufficiently considerable to allow of brief characterization. 



The rocks, of which the writer is now speaking, represent those 

 complexes which form the very foundation of the geologic architecture 

 in the Chichilni region, upon which the later formations were built up. 

 E. Xaumann^) says, when speaking of the Archîcan group in general, 

 " that the crystalline-schist system in Japan consists of mica-schist, 

 talc-schist, and chlorite-schist etc., together with subordinate layers of 



serpentines and marbles Those schists of the ' Bergland von 



Kwantö ' are also characterized hv a very complicated mode of occur- 



rence ^l^'^^^y describe a deformed are." His statements evidently 



refer to the region whi(h is now under consideration. But the rocks 

 here developed show many peculiar characters of their own, not 

 observed in the normal types of crystalline schists, and this abnormalîty 



1) loc. cit. p. 9. 



