210 f^- KOTÖ. 



hoi*iil)](iîi(lo, arc prcNont in ;i1)()!]t (N|!i;i1 (|ii:(iiHHos ; olio-doln so, Imf little; 

 ciciiv, \\o\\-i\]i\A\QA\ ;i|Kîii^o, nhiiiidüiit, Tho orliiDclnse shows well- 

 innrked midiihitorv extinct-iojis, niid i>s i-eiii;irkn])lc' for tlie zoiiiiiu'. The 

 unclear part seemw to differ greatly in clieiuicfd composition, as may l)e 

 seen from the nsnally dei^omposed state of its interior. It is a svein'tic 

 or dioritic o-raviite. Misled l;y its rndely r'dnsfose strnctnre, I once 

 looked upon it as an intermediate stage l)etween syenite and the 

 n]n[miiM:'K' schists of the ( h )zr!isho series ; and tlien thonght T mio-lit 

 be aljle to trace the gradu-al passage from one extreme to the other. 

 During my second visit to this district, however, I discovered a spot 

 wliere the ampliiholite comes in direct coiitact' with the schistose 

 granite, tlie former being sliarply cut by the truly irruptive granite 

 with schistose structure, well exposed on an abraded cliff at the water's 

 edge. I.ooked at from a distance a mrtrked contrast iri colour and struc- 

 ture soon suggests something quite lieterogeneous, and on close ex- 

 a'nin-ition the junction is still very clearly defined, the eft'usive granite 

 cutting in obliquely, independent (^f the schistose plane of fissile rocks, 

 while tlie latter is often convulsed and caught up in pockets within 

 tlie granite. Thi.-;, therefore, affords most conclusive evidence as to 

 the lieterogeneitv of the adioinino- rocks as re^-ards g-enesis. 



îTaving thus traced out, as closely as field conditions vvill allow, 

 the limiting edges of the granitic boss and tlie (rozaisho series, we ina.y 

 now proceed to examine the mode of occurrence of the uriderlying 

 Takanid^i series to the westwards. The last-mentioned complex is 

 widely separated liy the irruptive mass, of wdiich w^e have already 

 spoken, from the overlying Gozaisho series, and this holds true of 

 other sections wdiich we have had occasion to study. The two 

 series of the Upper Archaean are, therefore, alway:; separated, so far 

 as I am aware at present, by the interventi(^n of some foreign mass, 

 usually granite ; and no line of their direct contact has been ever 



