GAEBROS OF EAST SOOKE AND ROCKY POINT. 
47 
quartz, hornblende and mica, and oligoclase. The olivine gabbro 
was the heaviest of the differentiates, as well as much the largest 
in quantity ; it, therefore, occupies the central and lower parts of 
the mass, and covers about 90 per cent of its present exposed area. 
The augite gabbro occupies a peripheral position on the north and 
south coasts, and covers most of the remaining 10 per cent of the 
exposed area. The anorthosite, the only monomineralic rock 
formed, shows the effects of the incomplete sorting that took 
place, as it is found in fairly large bodies in two or three instances 
only, but occurs chiefly in little bodies, a foot or so in diameter, 
scattered throughout the augite gabbro. All of the granite that 
may have been formed has been removed by erosion, with the 
exception of one small outcrop on Possession point, on the very 
periphery of the intrusive. 
After the formation of the various rock types had been 
brought to an end by the increasing viscosity of the cooling 
liquid, regional disturbance took place, the effects of which were 
of great importance. The still semi-liquid mass was churned 
up ; but as the different phases were already too viscid to remix 
readily and thoroughly, more especially in the cooler, outer parts 
of the stock, the result was merely the partial destruction of the 
earlier gravitational arrangements of the rocks, the irregular 
interpenetration of one by masses and streams of another, and 
the production of gneissic bands and flow textures. It is also 
probable that there was a general straining off of small masses 
of liquid, acid differentiate, which went to swell the main body 
of granitic differentiate at the upper horizons. Besides replacing 
regular with irregular arrangements, producing gneissic textures, 
and assisting differentiative processes by straining off acid 
magma, the movements destroyed to some extent the gradational 
relations between the different types that had previously existed, 
and in some cases forced more liquid portions into intrusive 
relations with the more solid. 
After the events described and the consolidation of the 
rocks now at the surface was completed, they were intruded by 
two series of satellitic dykes, an acid and a basic. The latter 
were the earlier and of much the same composition as the gabbro 
