THE ARCH^AX FOKMATIOX OF THE ABUKUMA PLATEAU. gQ]^ 



of my Mikabu series, whicli form the basement of the paJœozoic group 

 of Japan. 



Sometimes they bear a striking resemblance to the chlorite schists 

 of my Sambao-;nvan series,' whicli lies directly below the ]\[ikabu com- 

 plex. The question ctjncerning the age of the Sambagawan series 

 involves serious difficulties. When the resu.lts (jf mv studies on the 

 schists of Chichibu^ were made public in 1888, I expressly remarked 

 that it is by no means safe to give the Sambngawan series a final 

 resting place in the archa?an group, without extended researches. In 

 spite of my warning -îgainst such a hasty conclusion, Dr. Harada" 

 assigned its place to the U])per archa3a,n, as had been done before him 

 by Dr. E. Xaumann. I do not as yet find any positive argument 

 that supports its archiean position, as no additional light has since 

 been thrown on the stratigraphical situation of the Sambagawnn 

 series. The relation of tlie Gozaisho series to tliat of the Samba- 

 gawan is unf^rtunatelv not very clear, and we must wait for some 

 time to come to see the final solution of the problem, whether 

 the two are geological e(|uivalents, or whether they succeed eacii other 

 in ])oint of time. 



[ take here the opportunity of expressing iny tlianks to Professor 

 Edward Divers and Director Dairoku Kikuchi for tlieir kindness in 

 assisting me in various ways in the revision of. the proof sheets of this 

 paper. 



1 This Journal, vol. II. 



2 Loc. cit. p. 49. 



