Extracts from the Minute Book of the Geological Society . 615 
At the spot called Sea Point, the waves have washed away all 
the loose earth, and left the rock exposed for a considerable extent. 
Here the granite and the schistus come in contact, and the manner 
in which their union has been accomplished it would be difficult to 
explain on any known theory of geology. In the space of 200 
yards along the shore, the reef is a chaotic mixture of these two 
rocks, each predominating in the mass as you approach its respec- 
tive side, where it is pure and unmixed. In some parts they form 
alternate layers of various diameter; in others, fragments of the 
schistus of all figures and sizes lie imbedded in the granite, which 
appears to have pervaded their minutest fissures. Between this 
mixed mass, however, and the pure schistus, there is interposed a 
rampart of granite, apparently different from the common sort, 
which, for about 200 yards is uncontaminated ; but as it approaches 
the schistus, becomes mingled with it in the same manner as the 
granite. From this to Green Point, and extending through Bobben 
Island, a distance of about twelve miles, the schistus is pure, and 
stands in strata approaching within a few degrees of a vertical 
position, inclining in some parts to the eastward, in others to the 
opposite point. 
Close to the path which leads from Cape town to the summit of 
the Table mountain, there runs a stream, which, at the point where 
the granite and the schistus meet, has carried off the superincumbent 
earth, and exposed the surface of the rock from ten to twenty yards 
in diameter, and about 200 yards in length, sinking at an angle of 
about thirty degrees. Along the whole of this space the schistus is 
intersected by veins of granite, varying from three feet in diameter 
to as many lines. These veins branch off in all directions, some 
straight, others twisted into the most fantastic convolutions. In the 
face of the rampart which borders the channel on each side, the 
Vol. V. 4 i 
