24 
MUSEUM BULLETIN NO. 30 . 
them too small to map, partly or entirely surrounded by the 
gabbro, and in some places not situated in any definite position 
with regard to the gabbro. Most of the granite masses are, how- 
ever, situated near the periphery of the gabbro stocks, and the 
two small stocks occurring along the boundary of the Sooke and 
Duncan map-areas are composed entirely of granite. In addi- 
tion, it should be noted that the granite facies is largely confined 
to the smaller, less eroded stocks, and is virtually absent in the 
larger and more eroded, like those of East Sooke and Rocky 
point.” 
JOINTING AND FAULTING. 
The dynamic movements affecting the rocks have been 
numerous but not large. At least eight periods can be recog- 
nized. The first, already described, occurred after partial 
crystallization had taken place, and brought about the internal 
relations indicated in the previous section. The second, third, 
and fourth preceded the intrusion of the three types of dykes. 
They evidently resulted in formation of fissures into which the 
dykes were intruded, and were jointing rather than faulting 
movements, as little or no displacement along them has been 
detected. In time, the movements resulting in the intrusion of * 
the noi\-porphyritic gabbroid dykes and the granitic dykes evi- 
dently occurred after the solidification of the gabbroid differen- 
tiate of the magma, and before that of the granitic differentiate: 
the movements resulting in the intrusion of the porphyritic gab- 
broid dykes occurred after the solidification, of the granitic 
. differentiate. The fifth movement appears to have resulted 
in the formation of large faults, with wide shear zones, and 
accompanying joints. Although wholly inferred, this movement, 
especially the formation of the wide shear zones, is necessary 
to explain satisfactorily how it was possible for the hornblend- 
izing solutions which escaped at this time to convert bands of 
gabbro up to 250 feet in width into hornblen elite, when the 
influence of the solutions when they rose through a joint crack 
does not appear to have extended more than 6 or 8 inches on 
each side of it. 
