
































a 
ee 
~s > — ae ~ had heer 
Sg SRL eee 
4 ° ° 
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B. N. A. BOUNDARY tan 
the higher part of which has been entirely removed by denu 
North of the last mentioned locality, grey granitoid gneiss again 
stitutes the shore, aud is traversed as usual by many felspar veins, som 
of them of large size and having an approximate east and west con 
and underlie to the north. Northward, about two miles from 
northern point of the island, hornblende schist appears with a dip o 
S. 39° W. < 55°. This is immediately succeeded by granite, being re 
portion of the great intrusive mass of North Island, and forming also the oa 
northern part of this island with the exception of about halt a mile ey “F 
the north-eastern shore; where the eastern end of a small auticlinal of 
grey gneiss overlaps the edge of the intrusive rock. The gneiss, besides | ‘ ‘ 
red felspar veins, is intersected by several of dark green diorite having 








an east and west course. The granite in the northern part of the island 
asserts itself by giving the country a much higher and bolder appearance, i 
and is evidently intrusive, as it holds detached fragments of clearly 
stratified gneiss near its junction with that rock. It is homogeneous, of | 
red and greyish-red tints and fine grain; and is traversed by occasional 
felspar veins, some of which were found to have a course of N. 30° W. 
51. Opposite the north end of Middle Island, North Island is composed — 
of grey gneiss, dip N. 37° W. < 30°, and probably connected with 
that just noticed. This is immediately followed to the north by pink fine- 
grained granite, enclosing large unaltered masses of the gneiss. The 
remainder of the island is formed of similar granite rock oe grey, greyish- 
red, and red tints, and very compact. Ua a 
52. The junction of this great mass of intrusive granite with the rocks ae 
to the northward, is concealed below the waters of “the strait which 
separates North Island from the mainlaind, and which is from, three 
quarters of a mile toa mile in width. The rock where next seen is a 
blackish hornblendic schist, dipping N. 68° W. < 40°, or away from the | 
granite, and including red felspar veins more or less nearly conformable 
with the strike, which are probably connected with the eruptive mass. | | 
53. The shore from this point runs north-westward for about eight ce 
miles, and is deeply indented with bays of very irregular outline, and — He 
fringed with high rocky islands. The rock, with the exception of two or 
three granitic masses of comparatively small size, is hornblende schist and 
a 
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ie 
re 
gneiss, and with a few exceptions, has a general south-westerly dip, and 
nearly coincides in its strike with the zeneral line of the coast. In a deep 
bay, a short distance west of the last mentioned locality, and separated 
from it by a boss of red granite holding gneissic fragments; black and _ 
