

ih Fac 
mA es 
a 
SM. A. iy COMMISSION. 



segregations in the nedomningliie felspar. It is traversed. ad "7 
systems of irregular felspar, and quartz-felspar veins. Going southw: ar 
changes to a syenitic granite, showing perfect felspar crystals in a 


rock a very dark colour. Here also many masses of altered sedime at 
rocks are sabi Bald Sull further south, red syenite of a sib app 



ng a a diorite dyke running N. 30° HE. was observed, min pe 
‘ appearance and course may possibly belong to the same series as th 
Bs, seen in the southern part of Flag Island. mPy 
66. Along its southern edge, and where almost in contact with the 























altered sedimentary rocks, the intrusive mass seems to assume a still more es 
basic character and darker colour; being represented by blackish dices ie 
of gneissic aspect, and grey syenitic diorite. In one place the sedimen- 
tary rocks were observed in close proximity to the granite. The dip | a. 
was found to be N. 25° W., or directly toward the intrusion, at an angle | x 
of 45°, the rock being a hal altered slate, somewhat resembling the 
Bee green altered rocks seen further south, but so much changed as to 

simulate a cleavable diorite. 
Isolated Area of Huronian Rocks. 
67. The area of altered rocks, which lies between the two western 
branches of the intrusive mass, is not separated by a great width of | a 
the latter, trom the rocks of similar character to the north; and as these _ 
$ have also similar directions and dips, the two may well be considered = 

ree tx 

a in connection. The most eastern portion of this area examined, is 
Hs composed of a hard grey rock of gneissic appearance, but consisting tg 
, “hy 
E mainly of quartz and hornblende, and in some places passing % a ier 
tt 
’ 
; distinct quartzite. It is then not so highly metamorphosed as ip 34 Bh. 
. obliterate the forms of the grains of sand, which are rather fine, and — a 
contain among them many hornblende crystals similar in size. This 
rock is traversed by many granite dykes, and by quartz-felspar veins, 4 
S ; which are newer than, and intersect them. It is probable that rocks ‘i 
; belonging to this area occupy the greater part of the large bay between 
Bucketé and Flag Islands. An island in this bay, not far north-west 4 
of Flag Island, is formed of fine grey hornblende or mica schist, dipping 
N. 20° W. < 45. It is intersected by many red felspar veins 2 to 3 feet — a 
wide, and st ro by small seams of vitreous quartz ; both of which nes 4 

