4 
MUSEUM BULLETIN NO. 30. 
members of the series as minute as may be desired. The more 
acid types also form a series ranging from quartz diorite to very 
siliceous granite. They are intrusive into the gabbroid types, but 
this relation appears to be a local result of movements affecting 
the masses prior to complete solidification, since other bodies in 
the Sooke map-area not so affected contain similar acid types 
that grade downward into the gabbro. 
A general regularity of arrangement exists between the four 
principal types. The olivine gabbro occupies the centre of the 
East Sooke mass, the augite gabbro and anorthosite are peri- 
pheral to it, and the single occurrence of granite lies at the 
extreme periphery. In the relations and .arrangements of the 
sub-varieties great irregularity is found. This is summarized as 
follows : 
Each sub-variety occurs in small, numerous, and irregular 
masses, that appear to possess no definite position within the 
body as a whole, but may outcrop at almost any point and in con- 
tact with any other sub-variety of the same principal type (i.e. 
olivine gabbro, augite gabbro, etc.) or of a different, but adjoin^ 
ing type. 
At some points one sub-variety may grade quite gently into 
another, at others very rapidly. 
Obscure and contradictory intrusive relations are fre- 
quently found between the various sub-varieties, and even 
between the broader types. At one place, for instance, a certain 
type, characterized by a definite composition and texture, may 
be observed to have a faintly chilled edge, at its contact with 
another type, to send off intrusive stringers into it, and to 
include fragments of it; whereas at another point of contact 
between the same two types these relations are reversed. 
The different varieties and sub-varieties are found asso- 
ciated in primary gneissic bands. Flow textures are also present 
in numerous places, particularly at the contacts between two 
varieties of rocks. 
In consequence of these irregularities, the present surface 
<of the gabbro mass is marked by widely varying textures and 
